[Excaliber]

Max rpm, or should I say, MAX HORSE POWER rpm is mainly dependant on the cam profile. Two things come to mind with high rpm.
1. Will the bottom end 'live' at elevated rpm numbers?
2. Will the heads, intake, exhaust profiles support your max cam profile rpm?

The shorter the stroke of an engine the higher the rpm potential. The longer the stroke the more difficult it is to make the engine 'live long'. So your stroked 351 is not necessarily a higher rpm engine or as reliable as a stock stroke 351 (using similiar parts in both engines). Laws of physics come into play.

But max rpm is more a function of the cam profile and ASSUMES the intake, heads and exhaust will support that profile at it's max rated rpm. Which also assumes your engine is built to 'live' at said rpm.