Bells can not be traded. They are removable yes, but not common. I am going to pretty much go ahead and say no, it will not bolt as the 300 6 cylinder has a common bell with the 351W, but many of the smaller 6 cylinders do not. Heck a 6 cylinder from a Maverick did not hove the same bell as a 6 cylinder in a Fairmont. I got burned on that one once. From the little bit of research I did just now, it is not promising.
I guess part of the issue, is there a particular reason you want to buy and install a Ford-o-matic? Everything I found indicates you are better off with a bit more modern transmission.
Ok the gentlemen im buying the vehicle from said it was the ford-o-matic in a 71 f100 so i havnt gotten to look into it more id just like to drop my motor in it and use the same tranny till i have enough for a proper upgrade