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I can tell you the tensioners are different between the 5.7 and the 6.1

I believe the base circle on the cams are different also.

6.1s run a valve spring "shield" intended to control spring "squirm"

6.1s originally came with a "blue stripe" intake valve spring - this is allegedly a higher seat and open pressure than the "green stripe" you'll find in most later crate motors.

The G3 5.7 valve spring's also use a "sheild", cup, damper or whatever you want to call it, but from my experience, the tab's have beeen known to break off so I went to a spring locator with shim's.