Essentially, you can just baout put any Chevy engine into a vette with modifications, some minor, some major.
Any carburated engine based on the GM 350 or 454 can be dropped in any C3 or earlier vette with relative ease.
Engines from the C4 era and up which rely on computer controls require quite a bit more work, as the computer adds another whole dimension to the install. But they too an be installed on C3 & earlier vettes.
"Crate Engines", such as the ZZ4, 383HT, ZZ430, 502HO, etc. are all factory built engines sans the carburator/fuel injection system. This way, they can be fitted with either setup.
I prefer to stick with carburated engines, as I'd rather ony have to deal with carb setup and vacuum issues, rather than dealing with computers, injectors, sensors, etc. Plus, I feel you get more bang for the buck hp & torque wise dealing with the typically carburated engines versus those like the newer LT & LS series engines...but that's just my opinion.