Yeah underside was painted. I dont remember the axle being painted. The frame wasn't painted either. All GM used was a black wax like creosoat to keep it from rusting.
A couple of things I noticed. Oil fill tube on backwards and the vacuum lines on top of the throttle body are misaligned. AC hose is bent on top of the radiator. Brand X battery. Miles look legit based on the condition of the engine compartment and interior.
Seems to me I remember that car. That dumb a$$ pin stripe just screams out for some reason. There was a car from Tampa that was posted some time back that I remember for some reason. I'll see if I can dig up the thread.