Its a 1968 Oldsmobile Cutlass 442 with a transplanted 455 cu in Oldsmobile engine and front wheel drive transmission from a 1968 Oldsmobile Toronado.
It was built in 1968 by Dave Landrith of Hurst Performance Reserch in Detroit for the use of his boss, George Hurst .
I have a GMC motorhome with the same powertrain.