Perfect candidate for a money pit, and after spending big bucks, what you have is marginally unsafe to drive, has terrible crash-safety results (lots of heads go through windshields), and tended to roll-over all to easy.

If you really want to go ahead anyway, it will depend on a lot of things, like model (about 15 different models in 70), style (Hatchback, notchback, convertible, wagon), sub-model (S, 442, etc), drivetrain/engine (at least 4 different engines, 3 different transmission, and 4 different differentials), and above all, the 3C's (condition, condition, condition).

Certainly check for frame rust, if there walk away. You may see a "442" that is actually a standard cutlass, so watch-out for flippers who fake models.

The most common engine was the Chevy 350, some had I6 or maybe a 400, real 442's had a 455 4-speed and Hurst shifter but very few were actually made !

Good luck finding a good one that hasn't been restored already, and watch-out, because a lot of what is out there is junk with new paint.