Thanks Tazz, And Welcome to the Forums!
I have looked through this thread and there seems to be some confusion on bell housings. The mount surface on the front of the bell is flat, the back of the block is flat, the engine/trans plate is between these flat surfaces, 4 surfaces in parallel, the starter indexes off the front of the plate which is the same plane as the back of the block, per application the ring gear holds the same distance from the back of the block, ergo the bell is inconsequential in depth of bendix engagement through the flywheel parallel to the axis of rotation.
Whew!
Of course it's a different story if someone has a bell with a step machined into the bell, or if a starter spacer is used. I think I have heard of such things but they would be way back in the cobwebs.
Anyhow, the problem with the V8 MII starter is the flywheel. The MII used a large heavy flywheel with, IIRC, a unique ring gear placed it's own distance from the back of the engine. Its been a quarter century since I've seen a V8 II flywheel next to a regular flywheel, I don't remember exactly how different they are, but the II flywheel is substantially less in diameter, somewhat thicker, and a bunch heavier than a normal flywheel.
Flexplates I'm not sure about.