inherited 68 cuda, starting issues

If I don't have an air compressor would carb cleaner and canned air suffice? Pull it, spray it, scrub it etc.

Better than nothing.
I like to start with the things keeping it from running and then go to stuff like oil, filter and the like.
It keeps you from spending a bunch of time and money to find out you have a rod knock or something else serious.
Not on your car necessarily, just as a general rule when working with unknowns.