When L72's were factory installed in a chassis where it wasn't an RPO (such as A & F body cars...B body L72's were RPO), didn't they always get the heat-treated rear axle parts?. Why would it be necessay on some but not others?. If the L72 was factory installed and available through the Copo process in a Nova, wouldn't you expect the rear axle would've come with it?.
And whata'bout the unique cooling system parts...necessary on the Camaro but not the Nova?.
On the '68 MV suffix 396's, didn't they come w/ a different carb than the other L78's?.
~ Pete