That laminated build sheet looks just like others I have seen & have here,including real COPO's.There's 3 major indicators on it that make me believe it's legit.
There is specific axle information on the build sheet.
It was also very possible to get either a 3.07,3.31,3.55,3.73 & 4.10 rear ratio in a 1969 L-78 Chevelle from the factory back then.
All have been documented.
Last edited by Mr70; 10-13-2017 at 04:14 PM.
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