well thanks, but the problem is i'm never really happy. I will go another season with pump gas with a few add ons. maybe I can lose a couple more tenths maybe not, but I want to see what it will do on pump gas first. end of next season i'll be looking at a race gas combo and that is the point of this thread. looks like i'll stay with the 4" with 13-13.5:1 and light parts. i'll have the heads looked at buy a mopar professional. can ya suggest a good mopar cylinder head shop?