Should I Replace AC Condenser?

Hey all. I just had my RV2 rebuilt by classic auto air. I also purchased a new evaporator and drier and will be replacing all the lines. Also rebuilt the dash box/ blower assembly.

Can I flush out the original 1976 AC Condenser of R12, or is it advisable to purchase a new one so I don’t contaminate the 134 system? Also, not sure how to test if the original condenser is even good anymore. I would appreciate any advice or help. I currently have the condenser in the car in its original location.