The answer to this question is, more appropriately, "How big is your wallet?" The frame on these cars is similar to what came on the 67-69 Camaros and Firebirds. There is plenty of room to fit a big block Chevy, Pontiac 455, Buick 455, Olds 455, and very likely a Cadillac 472/500 with factory parts. The Chevy big block can be made to over 700 cubic inches. This is not the cheapest option ($40k plus). There are many companies that offer frame mount conversions for almost any engine. If you have access to a welder, these frame mounts would not be difficult to fabricate.
how to remove a 1966 283 engine from a Nova
around 3500lbs
10w-40.
The 1977 Chevy Nova came with an inline 6 and a V8. They did not come with a V6. If a V6 has been installed you need to know which one as the chevy engines have very different firing orders.
Depends on the year
I've seen a 572 fit into one with no modification to the existing fenders or hood 502 Big Block
under the dash on the drivers side of the car.
The 75 - 76 Was a transitional year as for 69 - 74 where the same
Yes
12, to 1400 rpm.
5 on 4 3/4.
you can have anything from the 6 cyl. up to the 396 v8 in the 68 nova.