The 1961 and earlier Dodge and Plymouths, I'm not sure about the 1962 Imperials and Chryslers, B/RB had the 8 bolt extended crankshafts along with the the early cast iron Torqueflytes and 2 speed Powerflytes
To answer the OP question as long as the motor has is a 1962 or later with the six bolt flange crank that is threaded for the flex plate bolts, the early cranks used studs in the converter or flywheel with nuts on the block side to hold them onto the cranks
The early cranks had no extended center flange either to hold the converter hubs, the converters and flywheel fit over the outside of the crank flanges to center them