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M62 is way too small. M90 runs out of air about 6000 rpms.
Voice of experience as the first V8 SHO M90 operator.
I'm working on an M112 upgrade from my M90 right now. Have 30K on the M90 setup with much joy, but it is time for a change. Stock tranny only lasted 162 miles.
Heavily built tranny, with advice from Doug at Ford performance specialists - http://www.fordspecialists.com/ - lived for the whole duration.
Doug's tranny is gold - need more air.