IMO any factory roller cam small block would be harder to find then no-roller. That said most if not all of the 86+ one piece rear main seal engines are roller "capable". Meaning the were cast to be able to accept factory roller cam parts, ie. the spider and roller lifters, etc. But didn't have the finishing machine work done like drilling and tapping bolt holes. This was the case with the current 350 i'm running.
But then in 96+ you had the vortec motors come out that were all roller cammed.
But then in 96+ you had the vortec motors come out that were all roller cammed.