How do 318 powered A-Bodies do in NHRA PURE Stock?

You need to read the NHRA rules. The engine must remain essentially STOCK, complete with factory equivalent pistons, and the rules speak of using a thick head gasket to make up for head milling, so NO increases in compression, must run original TWO barrel intake AND original type carb, so no "big Holley" 2bbls adapted, no head porting/ polishing, etc.

First thing to do is find out what class the car would be in, and what end of the "weight break" it lands in.

The other problem with ANY stock type class is that you are dealing "against money." That is, when you have a situation like this, the "guys with money" can spend a lot of it tweaking a stock carb, and dyno time, which you may or may not have. The point is, it's more expensive and difficult to tweak (example) a carb like this, because there IS NO speed equipment available for them. And since they are LONG out of production, I have no idea where you get jets, etc.

NHRA requires you to BUY the rule book, but every once in awhile, I"ve been able to find a download link!!

Here's the 2012 to 2013 "rules amendments"

[ame]http://www.nhra.com/UserFiles/file/2012%20to%202013%20Rule%20Book%20Amendments.pdf[/ame]