I went from 3.75 stroke to 4.500, and skipped everything between that....so take what I say with a grain of salt.

as a long time student of these builds I have observed the usual difference that people mention is
the rod journal size. The Chrysler 2 and 3/8" journal needing noticeably more clearance grinding than the big block
chevy 2.200. The big end of the rod takes up less space with the 2.200 journal.

I would have to guess, between the 6.76 rod length and the amount of grinding there, yours most likely has regular 383/440,
2 and 3/8 inch rod journals.

additional clearance along with all the other options the big block chevy rod offers (length selection in .100 increments, wrist pin options, bearing options and so on)
is the usual reason many folks don't use mopar dimension rods in these builds.