Neat story! Unfortunately I know next to nothing about the history of my Swinger nor GTS.
I did look at the 68 GTS today - passed on it. It was a drag car with narrowed rear end, SS springs, headers, battery in trunk. No fender tag, could see, but not read the number on the block, and the number on the radiator support must have been the sequence number, as it did not match the vin on the dash.
Oh well, maybe next time.