Chris..these motors will run with almost all sensor unplugged, trans could be limpin.. they simply hardly ever stop. Overall the costs shouldn't be bad. GM produced a billion and the Impala's, Monte's and Regals were almost the same car. Get to know Rockauto and learn your Advance Auto discount codes and you can save about 40% off normal cost. Once you get it back up to speed, you'll be doing brakes, oil changes and an occasional trans filter service.
PS.. I er uh..upset a modded Subie one day. Somehow he didn't expect after he left me grannying around that corner that I'd walk him on the highway.....in a Bonneville. Sad part is..he's probably still scootin along and after the millionth transmission I demodded.