I agree with the gear change. It makes a big difference. I think that and converter choice turns setups into dogs.I get not wanting to do it yourself so you can get it done quick and drive it. Especially if you trust the guy/seen his work but if you plan on Taking a 90s vortec 350 youve never heard run, or inspected is pretty ballsy. I'm not knocking you or choices, But if your not doing the work anyway, why not just put a stock gen 3 truck engine in it. Your car being fi helps alot as far as the fuel system goes. I'm pretty sure if you incorporate the front 02s and maf sensor, You'll only need vats deleted, no tune. I could be wrong(probably am)If your gonna use a straight from the junkyard engine,why not use the best one for that application. Then take the next 2500(350vortec cam swap)$$ and put a cam,headers and tune.
If you have vortec and not tbi heads you need a different intake edelbrock 2116
Based on the popular and powerful Edelbrock #2101, this dual-plane intake is designed for the street rod, industrial and engine swap market utilizing 262-400 c.i.d. Chevy V8s with 1996 and later Vortec (L31) cast iron or the new Edelbrock E-Tec aluminum heads. Manifold has provisions for...
www.speedwaymotors.com
. You'll probably need to get the mechanical pump boss machined for the pushrod. They make lock up kits if your using a 4spd.
Free Shipping - TCI 2004R/700R4 Lockup Wiring Kits with qualifying orders of $109. Shop Torque Converter Lock Up Kits at Summit Racing.
www.summitracing.com
And make sure to get a melonized distributor gear if it's a vortec 350 it has a roller cam. Those headers work. I had them on my monte. Pita to install and rusted fast af. Like 1 yr. 2k miles. It's really humid here all yr though.
Also, this might be the most important advice....make sure he rids your engine bay of the unused harness/wires. And post some pics of the car please.