Converting Hyd Roller Lifters to Solid

Also, without comparing actual measurements I don't see how that statement even makes sense.

People use chevy rods, rockers etc on these motors, the only thing that should matter is the size, not the application.
It's the size that's the issue (according to the guy I talked to). Chevy lifters have a .842" OD whereas Mopar lifters are .904" if I recall. I would assume the OD of the snap ring groove is larger on the Mopar as well.