[TimG]

Two things indicate a possible original LT1 Corvette. The tach redline is at 6,500. In 1972, the LT1 was the only engine with this redline. The rear yokes have big block style caps instead of U bolts, this was part of the LT1 option and the only small block Corvette to have a big block rear end. No number on the engine, but it would be interesting to see the code on the differential.
I think it's a pretty car.