I think the transmission should bolt right up. I bolted a 2f flywheel to my 3fe and the bolt holes had to be just slightly enlarged. Based on that the bolt holes for the a440 flex plate might be a little big, but I wouldn't think that would matter. If it really was a concern you could probably get a flex plate from a 62.
There are two types of 3F-E cranks. There is a difference at the end of the crank where the torque converter aligns. One is larger than the other. I think the 91+ crank has the larger hole.
The six bolt holes are the same size as well as the mounting surface for the flex plate/flywheel.