Cam swap without pulling motor

Valves that have hardened tips(not all do), often don’t have the hardening extend below the tip very much, so I wouldn’t be grinding enough off to try and improve the rocker geometry.

I’d set the rockers/shafts on the heads while they’re on the bench so you can easily see what the rocker to valve tip situation is like, and get a game plan in your mind of how that will need to be(if it needs to be) addressed.