I've got an internally balanced 340 with an aftermarket 8 bolt crank and a converter with the larger "hemi" bolt size. I believe the bolts are on a 10" bolt circle but I can't remember for sure (it's a 10" coan# 40312) So would the B&M flexplate work? here I copied it. IDK what the small bolt circle is or if I have it
SFI Flexplate - Chrysler
Application:
Chrysler '62 & later internally balanced 8-bolt crank - A-727, A-904 (Small bolt circle only 10")
Item# 10231
SFI Flexplate - Chrysler
Application:
Chrysler '62 & later internally balanced 8-bolt crank - A-727, A-904 (Small bolt circle only 10")
Item# 10231