[Formulajones]

In the op's case, if we are talking about a real RAIV, I'd be more inclined to keep the RAIV flat tappet cam in it just for purist sake. But I'd take extra precautions.

I'd be nitriding the camshaft and I'd be using a lube option style lifter from rhoads which are modified hylifts. Then proper break in while it's all fresh and not sitting a decade.
I don't have issues with flat tappets doing this, but I end up spending a grand or more taking the extra precautions. I'm usually approaching half the cost of a roller setup.

I would not be against a RAIV roller from someone like butler though, but again I'd only run hylift rollers on it and the setup starts getting spendy.