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I replied to you elsewhere Paul but that is a 64-5 only housing for a 500-600 series with a 330 or 361 V8.
Sounds like an early FT but I dont know why it is unique to those years and models only.
Carl, As usual, thanks for having the information. I suspected that this would be an FE/FT bell, now I hope it bolts onto the bellhousing mounts in my 54 F100.