427 is 427 no matter how you get there.
An FE 427 isn't anymore powerfull then a 427W.
I don't remember ever seeing the transaxle of a Mark II "40". I didn't say I didn't. I just don't remember seeing it. 500hp is 500hp no matter how you get there.
I do know that the Mark IV's didn't use a ZF.
I believe that the story is that Phil Remington had a transaxle built for it using Ford 4speed internal components because of durabilaty problems with the ZF.
I haven't read anything about folks blowing up the ZF with there 4xx's yet, have you?
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