Yes.
The bumpers from a 1970 Chevy Nova SS will not fit a 1973 Chevy Nova SS without modifications. While the two models share some similarities, the bumper designs and mounting points changed between these years. If you're considering a swap, you'll likely need to adjust the mounting hardware or brackets to achieve a proper fit. Always check compatibility with specific parts before making any modifications.
No
with the exception of the bumpers & bumper brackets they are identical
Yes. The only difference besides the inside door panel is the 73-74 doesn't have the wing vent window like the 68 -72.
Yes.
where are the holes located in the roof of a 1972 chevy nova for seat belt installation
No
If it is the same bodystyle, yes
No.
Yes it will bolt right on.
8.5.
Yes