1) Design a bell housing that has the right spacing for clutch placing and clearances, and bolt configuration. 2) Have a place on the drivers side to place the clutch line. 3) Make sure the starter mates up to the flywheel correctly. 4) machine shifter linkage parts. 5) Machine a new designed tranny mount. 6) Have a custom driveshaft made. 7) Would have to use T56 compatible clutches only.
And who knows what other problems someone may encounter while trying to do the swap.