The cams are all interchangeable. They all fit. You can even use exhaust cam on inlet.
As for setup, of course everything makes a difference. I would choose to put the longer duration cam (272) on the inlet. But you don't have to. Your next choice is lobe centre position, or cam timing. You need a degree wheel and adjustable gears. Or you could just chuck them in anyhow...
The smallport and bigport dizzy is interchangeable I am told, but not identical.