Since I used the original Cruis-O-matic bellhousing adapted to the AOD pump, it is very similar in size to the original Cruis-O, just a bit longer in the tail section. I don't know how the Quicktime bell compares to a Cruis-O bell, my guess is they are similar, I never had both out of the cars at the same time to compare. I used the Quicktime bell in my '76 F-250, and there was all kinds of room in that thing.
My buddy put an AOD behind the 428 in his '64 Marauder. He used the Bendsten's adaptor plate which is 1 1/2" thick and pushes the entire trans back that much. His bell was very tight to the firewall, and I think he even cheated the motor forward a bit on the mounts. Headers were an even bigger problem with the Bendsten's Adaptor, much cutting and massaging was required there.