1968 Dart question....

Between certain types of men, a handshake is as strong as any legal document,, and his "word" is his bond..

I'll bet your Dad was one of those men,..

Try and live up to those standards.. and you will be well respected ,, as he likely was..

RIP.. amen

Anything more than offering to buy the car back (after inspecting it carefully) would be disrespectful, to your Dad.. imho

hope it helps