86 Black Roller 318, swap/interchange into 72 318

Plan is to re gasket Blue 72, to my knowledge bone stock, slap together performer and 650 on for now. 86 is from you guys say will be a one I want to take time on to do right. Ran before I pulled but leaked everywhere. Wanna maybe go with magnum aluminum heads. Shame too, 86 heads were 302 j heads. 300 horse is a good learning start.