This is mainly to John Witzke, but please anyone with answer, thought, Idea please chime in.
I am the second owner of a 78 T/A W72 4spd. The original block is double stamped X7 then WC right over it. The vin stamp matches my car, all the casting numbers and date codes are correct for a W72 Engine.
My theory is either the engine or the car was earmarked to be an auto and was changed last minute(so to speak)at the factory to a 4 spd. I know the history of the car, I bought it from a very close friend of the family, it has always been a 4spd since day one, He is not the "CAR GUY" type that would know about stamping, casting numbers and such, nor would he care.
So the question John and others, have you heard of this before, the double stamp?