Even if the Copo trans decode is true it doesn't mean the car it came from was an L72 car as being a '69 it could've been any motor but equipped w/ Copo 9511 rear axle?
Note the trans designation on this '69 'Vette tank sheet we looked at here a few months back.
http://www.proteam-corvette.com/cars...9L88COPO10.jpg
Welcome aboard Rich!
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~ Pete