There shouldn't be any problems. . . .The TCC may have to be changed, but I don't recall. The Mark TC will work if you use the flexplate off of the Mark motor, otherwise, it will not line up properly (bolt pattern).
Currently In the Short Bus Garage:
2 - '94 T-bird LX's 4.6L (one with 300,000+ miles and one with 200,000+ miles)
1 - '97 Mark VIII LSC - INTECH V8 (120,000+ miles)
1 - '97 F150 XLT 4x4 Flareside, 4.6L (130,000+ miles) - Currently being dismantled and rebuilt with upgrades!
1 - '00 Mustang GT (likes to accelerate with the brake on!), 4.6L (60,000+ miles - only comes out when I need to get somewhere fast.)
oh yeah, and they all have 4R70W's