What Fits Under Factory Valve Covers?

Just use the MP chrome valve covers. Most anything will fit under those. What rockers do you want to run? If it was me, I would run something like the Erson/MP/Crane ductile iron adjustable rockers. Not available new, but come up all the time on Ebay and sometimes here.

I was looking at the PRW stainless 1:6 roller rockers, I’m trying to avoid aluminum rockers