The timing marks are on a tab adjacent to the harmonic balancer.
It's 5 degrees BTDC.
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.
8 degrees before TDC
go to the library and get a chiltons repair manual for your nova.
There is a Chevy Nova, a vehicle made by the GM company Chevrolet, from 1962 to 1979. (For the astronomical nova, see the related question)
According to NovaResource.com, 1976 was the last year to get an SS option for a Chevy Nova. 1979 had an rally package option.
The RWD Nova compact's last year was 1979, the FWD Nova subcompact's last year (the Toyota Corolla clone) was 1988.
4 degrees advanced, or, BTDC, should work just fine.
1961 to 1979, then the name was rehashed from 1985 - 1988