WOW! My old Dad dropped a bomb on me...

I, personally, would have some hesitation taking it. I would wait a bit until you can see hm in person to discuss it. Of course, I would be overly appreciative until then but would want to make sure that it's not out of guilt for not getting your Dart "where it should be". The 10-15 years before my father passed, he became more concerned that he was getting older and could no longer help his 6 children like he used to and tried to compensate with generosity and materialistically. I for one always told him there was no need for that and that his love, support and kindness throughout my life was enough and that where I was in life and what I had accomplished was all due to him. If I were you, I'd try to make sure that it was "all" for the right reasons and go from there. I see everyone so far is very willing to take it without any deeper thought behind it. If you do take it, I would think about how to repay (financially and supportively) your father for it. Financially, you could sell everything you have in the Dart and give it to him for his Challenger project along with sending him so $ when you have it (as if you were sending it for the Dart) or you if you don't think he would accept it, buy pieces for his Challenger project. As for being supportive, I'll leave that up to you. Good luck with your decision.