Dad's 69 'Cuda Fastback...Where in the world is it?
If I may suggest......
Play on his sympathy. Call him up and ask if he would BRING THE CAR over for your dad to see. Offer to pay for his gas etc. Maybe, MAYBE he would do it, and once there decide you SHOULD HAVE the car back.
I suppose I'm a bad person for suggesting you USE your dad like that. BUT..... I think in this case the means would justify the ends.