I am now restoring a 63 panel. The 327 began in 62, it could have been an option but not likely for a panel. panels were specifically for product delivery (mine was a bakery truck), disc brakes were not an option. The powerglide i'm almost sure would have came with it since mine is an original automatic (engine and trans were not in truck) there would be no windows. if it had side windows it would be a suburban which came w/tailgate glass type of rear doors-panels came with "barn doors' also there would be no back seats and original fronts would have been buskets. you can ad back seat which what i'm doing. Mine will have bucket front and two short benches in back. any ?s email @ [email protected]