So I have a 400 sbc that I use to have in a old street /strip 72 Camaro. Sold the car years ago and now thinking about putting it in a 94 s10. The motor is a stock rod .30 over speed pro forged stock pistons. It has a set of 041 heads on it now but I'd like to upgrade them if it cost effective. Any good cheap replacement recommendations ? This is going to be a power upgrade for the anemic 4 cly that's in the truck now. 99% chance that it will see NOS somehow in its life.