John's Muscle Cars
He really helps me out for a fair deal on car parts. Not intending this to be spam. This could be very helpful to you or else he could point you in the right direction if he doesn't have what you are looking for. He has hundreds of classic cars!
There was just one at the police impound auction. About half restored. It went for $600.00.
I thought I was bidding on it (there were a bunch of guys packed around it so I couldn't see the autioneer). It turned out I bought the vehicle next to it LOL Oh well, it is a cute little Ranger I now own.
But those Mustangs are always in the impound auctions I go to. You might want to see if they have those auctions in your city.