They're different diameters from the 65-up. These were for the 5 bolt bell housing transmissions. The imbalance weights are the same, just the size of the flexplate is different.
Yes they will, at least in a 74, not sure about the earlier models. I'm running a big bell, dipstick in pan C4 out of a 77 Granada in mine. It came from behind a 351W. My 85 T Bird 302 engine came with an AOD behind it, and I'm using the same 50 oz, 164tooth flex plate that came on it. So all I'd have to do to change to an AOD would be change torque converters and trannys, and get a crossmember modified or use one of Frank's.
