86 Black Roller 318, swap/interchange into 72 318

lemondana said
Be better to use the 86 block, should be a roller cam engine.

Care to share why? 86 has yes a roller cam, hyd lifters, 73 340 crank. Would prefer to sell 86 block. 340 internals 318 Blue 72 block would be me goal atm. Maybe get a solid roller comversion. Wanna build a reliable Blue 72. "YOUR MY BOY BLUE!"