The timing marks are on a tab adjacent to the harmonic balancer.
It's 5 degrees BTDC.
Yes.
Yes.
If it is the same bodystyle, yes
either the idle is set too high or your timing is advanced too far.
8.5.
4 degrees advanced.
The 1987 Chevrolet Nova timing belt is located on the front of the engine. You will need to remove the engine cover in order to see the timing belt.
You have a 1973 nova 350
10w-40.
8 degrees before TDC
Probably a Turbo 350 short tail.