<https://7173mustangs.com/forums/topic/22860-fmx-to-4-speed-swap/#comment-235103>
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"I am doing the same conversion to mine.  FMX to 4-speed.  The block plate that you are asking about needs to be there, but is no different from automatic to 4-speed.  I don't even think they vary by transmission.  I mean a small block bell housing attaches the same as a small block tranny.  The 351C has the small block pattern.(Same as 289/302/351W.)   I was told for years from various people that the 351C did NOT have the small block bell housing, but it works on mine. \n  \n\nNow having said that, mine is still disassembled and not in the car, but I have multiple copies of most all the parts. \n"
<https://7173mustangs.com/forums/topic/22860-fmx-to-4-speed-swap/>