Welcome,

Consider doing the basic engine maintenance & testing first:

- replace oil & filter
- tuneup (replace plugs, points, condenser, cap)
- replace air filter, fuel filter, pvc valve
- add gasline antifreeze to displace water in fuel system
- antifreeze flush & replace
- check ATF level (auto trans)
- cylinder compression test
- set dwell & timing
- spray carb cleaner down the throat of carb to clean
- inspect vacuum lines and caps for cracks and replace as needed
- inspect fan belts for cracks and replace as needed
- inspect exhaust system - mice in you mufflers??

Good luck!