Re:
Is that the whole number? Four digits?
You might want to clean up the existing paint before making a final decision on whether it needs a respray? Difficult to tell from photos. Could just be dirty from thirty years of storage.
Otherwise, don't let anyone blast it unless they understand and are familiar with old lightweight bicycles and the tubing they are built from.
If the seatpost came out that easy, that's a good omen. You might need to do no more than disassemble each component in turn, clean the parts, regrease and reassemble. Maybe all you'll need to replace are the soft bits.. tyres and bar tape and such...