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.
FYI, the Crane Ductile iron adjustable rockers ARE still available. I literally just ordered a brand new set from Summit Racing yesterday for my 440.

460 bucks.


Crane Steel and Ductile Iron Shaft Mount Rocker Arms 64770-16

They also make the same rocker in a 1.6:1 ratio as well