It al depends on your driving habits. Generally you can expect between 17 and 19 miles per gallon.
The 69 Nova had the small block 302 c.i.e.
Nova - 1974 One Small Step 5-4 was released on: USA: 25 January 1978
First of all is that a 350 is not a big block. It is a small block.
pooop
18436572
My 64, with small block, and automatic was just under 2700.
I believe that all small block v-8's until 1980 should fit no problem,I swapped a straight 6 out of my nova to a small block 400, and just recently a small block 350,
I have a 1974 nova and my has 15 gallon
Not without modification. The 1973 and 1974 body styles are unique in the Nova series.
30mpg
The exhaust is different, and you will probably need a bigger radiator.
Compression ratio on a 1974 Chevy 350 in a Nova was 8.5:1.