All Carl said was that they were BB Fords with the TRS drive behind a BW tranny.
The larger TRS drive was still pretty new, having been just introduced in '62. It was called the "Mercruiser II" when it was introduced.
I imagine that in 1964 the motors probably were actually medium block motors. i.e., the FE series engines, (332/352/360/361/390/406/410/427/428) which many called "big blocks", made from 1958–1976. The later 370/429/Boss 429/460/514 motors are also medium block motors, being developments from the FE series.
Fords true big blocks in that day were the MEL series (383/410/430/462) block, and the "SuperDuty" series (401/477/534) big blocks. Ford actually made a 601 c.i. version of the MEL block for one year only, in 1963, for use as a passenger bus motor.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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