Mopar made only 2 flex plates for the stock 904 tranny cars that I have heard of or seen, that being said they where 11.0 inch converters with 5/16 converter bolts the smaller 10.0 with 5/16 bolts.
On your deal your probably going to need a Hi Po 727 6 bolt crank pattern for either the 11.0 inch pattern with the 7/16 bolts or the other one for 10.0 inch pattern with the 7/16 converter bolts.
B&M use to offer a solid universal 6 bolt flex plate with all four patterns on them, not sure if they still do and how good they are now confused scope
Good luck, Mopar offers the Hi Po 6 and 8 bolt Hi Po flex plate for internally balanced motors only with the single pattern for the race converters with the 7/16 converter bolt sizes in both SFI specs and non SFI specs scope
The converter size determines which flex plate you will need, not the tranny case scope

Last edited by Cab_Burge; 10/19/19 02:27 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)