Bucky runs one of the fastest Hemi heritage 68 Barracudas in the US, he knows Hemis and has been around a long time he might have known your FIL and maybe knows some info about the car. Never hurts to ask, hes into racing.
Local tracks in the 60-90’s I used to go to were Mason Dixon in MD, 75-80 in Monrovia MD, Capitol Raceway in MD. Bucky would have been around those tracks as well as any drag strips in WV in 1972. BTW that car in 1972 would have been a very stout performer one of the fastest door cars at the track.