1989-91 360 roller cam engine questions

Awesome. I’ll look into those pistons. You think 89 octane would still be do-able with 9,5:1. He’s a high school kid and has to feed the fuel tank. We’ll get the replacement valves and go from there. I didn’t like the idea of cutting the seats either. I appreciate the feedback on the HP. I really hope we don’t have cracks. I didn’t see any but I haven’t cleaned the heads well yet and the valves are still in them so not sure if they are starting to crack or not….or do they just crack all the way all at once?