Nothing has gone wrong with my car except for a few battery changes.
The car is all original and it is a beauty.
Some other details would have been nice...
And I hope you changed the oil at least once in the past 42 years...
I bet if you haven't replaced tires, hoses, bushings or other rubber parts, you soon are going to have to. I don't care how good of condition it is in, 40 year old rubber equals lots of leaks and suspension noise...
Hope you've done a coolant flush once in a while...
Rusty coolant equals rusty, and leaky freeze plugs, water pump and radiator...
Definitely wouldn't buy that car from you if you were selling it, you've done no maintenance so that means its in great condition now, but the first time someone drives it past the drive way it will totally self-destruct mechanically...
Have fun with that...