No. The subframes are not the same. The 68-74 had the steering behind the crossmember and 75 and up had it in front of the crossmember.
yes
not without modification
Yes
yes, they are the same exact cars the only differences are the front headlights and grill and the tail lights otherwise the cars are pretty much the same. so yes, a 73' nova hood will fit a 70'
No, they're 2 different grilles
Yes. No problem.
Yes
Yes
It should as it's basically the same body.
Yes it will bolt right on
Yes it will bolt right on.
Yes. The basic front fenders are the same and interchangeable for 70-74 Novas.