Today I talked to a Ford engineer who works on the GT Ford project and on the side has installed a FE in a CAV. He used the ZF 5 speed because the engine was about 450HP and is used for cruising. He told me that the ZF 6 speed or the porshe 50-52 would handle a big block torque. The 50-52 linkage would be difficult to make work along with input shaft mods, so I guess it will be a 6 speed ZF, Wayne