i got 79 powerwagon im going rebuild my 318 im going use 302 fast burn casting heads im look for good low end power to mid range and bring compression around 9s or 10s im have trouble with piston choice i dont wont use speed pro or keth black i dont wont use piston that got the coating on piston skirt look for good flat top 4 Valve Reliefs any buddy hear about DNJ ENGINE COMPONENTS Part