What trann you use will make the determination...I think both Novak and Advance Adapters make kits for the motor mounts to put small block ford into the M715's...the stock tranny is also considered in their kits if I am not mistaken. Also the older fords came with a t-18 which is basically the same tranny as the stock t98, with a little different bolt pattern for the ford bellhousings and a little better oiling I have heard...basically this would be a "fit" for a 351W as you could find a whole ford setup engine flywheel, bellhousing, tranny ,all in one vehicle maybe if your lucky, and do it as a unit.
If your going to use a different tranny, then it would be impossible to say what you need to do without knowing which one.
brute4c
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!