didn't mean to offend anybody here...just at $350+ plus what ever the exhaust shop is going to charge, for an mild muscle car I don't see the value. As for a racer, or a boosted car it is a good thing to have. I used a similar product on a boosted 440 I ran. You kinda need it so you don't start burning up things. I just don't know how much of a gain you are going to see using that set-up on an older, mild big block. You'd probably be able to come almost as close tuning the "old fashion" way.