the 8 bolt crank in my 440 has a 3.950 bolt pattern, and the holes are tapped 1/2-20 thread.
the TC register is 2.155 OD, and 1.812 ID, .660 deep.
the 392 adapters i have also have the 3.950 bolt pattern as well as the same TC OD and ID.
however, the 392 adapters are not tapped, as they register on the crank flange OD and are sandwiched between the crank flange and the flex plate.
hope this helps if possible.