Theoretically what should this thing run with the parts I have now? Either way I may use the extra parts laying around to build a junk yard 440 lol. I have a 68 hp block sitting here. Well I guess I'm like a woman who can't make up her mind on what purse goes with her shoes Lol. What rpms am I looking at with these pistons? They are heavy but will that effect the cast crank strength? I need to figure out if this big cam will push the valves into the pistons. The pistons have no reliefs cut. Do you think that is an issue or do I just clay test? Is the biggest cam I've ever bought. I really wish I could upload these pics because that would save me from having to explain everything all over again. Thank you for the quick reply.