Welcome. That's a rare combination for that year. Ford was pushing the Mach I and the Grande in 1969 and the GT option was low on the list. The 1969 body style was my second favorite (I had a 1969 Sportsroof, 351W 4V, 4SP, black - red interior). If you haven't done this yet or if the previous owners didn't either , consider adding a Monte Carlo bar and export brace to stiffen up the front end.
Jim