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That "chrome" vinyl wrap looks atrocious on everything that I've seen with it. I've never been a big fan of Davin spinners either, and those are...
The permanent models actually provide less coverage for the ignition switch than the removable models, that's why I don't recommend the permanent...
The other models listed at the top of the page with the "P" in front of the number are the permanent models.
This is the one I've used for the last decade on my B & G-Bodies: http://www.lok-itt.com/models/300.html
The removable column locks are more effective than the "fixed" locks. Check out http://www.lok-itt.com/models.html
1970 Buick 455
Check on v8buick.com
I have a '70 Buick 455 in my '83 Cutlass
I would also check to see if it has a posi/lsd. My '87 MCSS had 3.73 w/an open diff.
Main problem is the Flowmasters. Buy some regular, cheap chambered mufflers and add an X-pipe.
20s aren't big. They should go right on there with the right tire size for a car not a truck.
That is why it's better to not to try to intermingle in my opinion. People like that get so butthurt when you gap them in a race with your rims...
I usually run what the tire manufacturer's recommended pressure is listed as.
Best calculator to use that I've found so far: https://www.ringpinion.com/calculators/Calc_RPM.aspx#TireHeight
275/60/15s are the biggest tires I've had on my Cutlass.