Chevy race man 383 Ok I got a smaller gasket and stayed with 62 cc heads. Ok with a,.125 dome piston will I have clearance issues. Standard decks. And does octane boost really help or can it hurt a motor cause I will probably run some or always. And what should be my total advanced timing I have a distributor spring kit what should I use? My email is [email protected] I would like to keep in touch because I'm starting to put it together saturday so please please e mail me