As does having EGR. Which then allows more timing. And can also be disabled easily.
Passing Emissions
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As long as the carb is tuned in close, you aren't running a lumpy cam or one with a crappy LSA, and you have a catalytic converter installed, a sniffer test shouldn't be a problem. If you have to have all equipment installed and functioning to pass, the LS swap starts to make more sense as putting all the correct old equipment back on the old engine will not only be hard to find and expensive, but will limit it's power. An appearance only check will fall somewhere in the middle.
I thank the Lord every day for no inspection BS here.
I thank the Lord every day for no inspection BS here.
after what I ate tonite I'm glad I do not pass emissions.... 
.......yetafter what I ate tonite I'm glad I do not pass emissions....
Since your registration is outside Bernalillo County, you're exempt. The Governor signed up for stricter rules...but only for 2011 and newer vehicles. MVD says nothing about any upcoming changes to add other counties.
Emission Testing - NM Motor Vehicle Division
All motor vehicles that are more than four years old and are driven into, operated, or are otherwise present in Bernalillo county for 60 or more days per year but are registered in another county or state shall comply.
www.mvd.newmexico.gov
PS...if you go with the 383...get the rotating assembly balanced. I think Knighton's still does it. Peace of mind.
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If you did, the cat might object.😾after what I ate tonite I'm glad I do not pass emissions....
Not really. Most of the factory emission systems do not affect power. Most only operate during cold start up and shut off after the engine is warm. Most of the low power was caused by low CR, peanut cams, cheap timing chains, and poor flowing exhaust manifolds. One guy ran a 406 with full CCC emission gear. After being pressured by friends he ripped all the CCC out and put in a Holley. He only gained one HP and lost several MPGs, he regretted removing the CCC and considers the Holley swap a complete waste of money and time.
Emission legal LS swaps are very expensive as only the $7,000 Erod crate LS engines from GM are legal. Standard production LS engines from junkyards or other used sources feature enhanced EVAP systems that will not work with any factory G body gas tank, rendering such swaps illegal. Many junkyard LS swaps in CA have been failed over this. One guy even had to sell his complete junkyard LS swap and replaced it with a Erod LS to finally pass.
If the OP needs to pass emissions, he may be better off buying another G body that is bone stock and hasn't been butchered and hacked by POs.
That makes no sense at all.
Buy a sub-$100 converter, and buy a complete take out stock turd of an engine. Most people doing engine swaps on formerly running stock gbodies can hardly give the factory engines away, and usually give them up for scrap.
Unlike a modern car the entire emissions system is basically on the engine. Worst, absolute worst, case scenario is you buy a take out engine for almost nothing and pay a few hundred to ship it. Instant complete emissions system.
If your harness was cut just unplug it from the firewall and replace with a used one.
No need to do something ridiculous and drastic like sell a known car, repay tax/title fees on a replacement.
Even if the CCC system doesn't cost any power, which is arguable, it still isn't cost effective to buy all these parts new. The one county in NM that does have inspections checks for visible smoke from the tailpipe, that the catalytic converter is installed, and the gas cap is checked for leaks. 1985 to 1995 vehicles also get a sniffer test.
This isn't Kalifornia, you don't have to throw the whole car away and find an unmolested original, just to get past an emissions test.
If you install a catalytic converter, get the EVAP system hooked back up, and make it run clean through a sniffer, you are probably going to have no issues. You could theoretically upgrade to an OBD 1 TBI system, and have a clean burning computer-controlled engine without having to re-install the AIR injection system. It would look period correct for the vehicle, and the wiring harness out of a truck or van is almost drop in.
This isn't Kalifornia, you don't have to throw the whole car away and find an unmolested original, just to get past an emissions test.
If you install a catalytic converter, get the EVAP system hooked back up, and make it run clean through a sniffer, you are probably going to have no issues. You could theoretically upgrade to an OBD 1 TBI system, and have a clean burning computer-controlled engine without having to re-install the AIR injection system. It would look period correct for the vehicle, and the wiring harness out of a truck or van is almost drop in.
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