Yes just a push rod change depends on year, and you can stay with the adjustable rockers if you like, or get a set of stamped non-adjust rockers.
the Isky e4 cam has been the recommended replacement in several threads.
My engine builder said he could install a hydraulic cam and lifter set-up and retain my adjustable rockers.........I'd never heard of this before, and he told me of a 440 they have set up like it........
Is there a BENEFIT to him installing it this way??
No hijack intended.......I think we're on the same wavelength here.......