Is my 1975 Mustang II even valuable?
They're not really worth anything.
They were made during the fuel crisis, and had horrible power ratings, and were regarded as pretty damn ugly.
There are some people that like the 74-78's.....but not many.
Anyone who claims that a car is worth a lot JUST because it's old....doesn't know what they are talking about.
There's TONS of cars,trucks and motorcycles that are very rare and old....but aren't worth jack!
It really depends on the market sometimes, but it also depends on the exact reasons the vehicle isn't popular....
Sometimes it's the motor, or body style.
Or it was simply produced in a very Un-eventful era in history....and really has nothing unique or special attached to it.