My 422 smallblock build

"Chrysler's use a bigger diameter core than Chevrolet. That means for the same lift, the Chrylser will have a higher wheel speed."
you thinking rpm with the larger wheel YR?
AFIK all retrofit hr use the .700 wheel
What's oem mopar hr?
you can fit a .815-820 in a.904 lifter bore oo big get too narrow
or bore to .937 to clean up the lifter bores
with keyed lifters even larger
I've used isky's
On the same cam the smaller the roller the higher the roller rpm.
The junk Comp retro fit hydraulic rollers that unfortunately are in my 340 have a .810 diameter roller.