I think Bob ran 314 cubes because he could get the most favorable power to (NHRA Factored) weight for a wedge head Pro Stock in 1979

Another huge advantage to the Arrow was it was narrow and had so much less frontal area compared to the typical A or F body or even the Camaros and mustang II's of the day.

I can't remember the first Fox body Mustang Pro stocker (maybe Nicholson ran one?) but I think that body style debuted in late 78, but the Arrow was still slicker than anything the competition was running. It almost looked like a Toy compared to other cars going down the track.

And for 79 I think Glidden ran the Fairmont instead of the new Mustang because back then I believe there was still the "Tiuana Taxi" weight break for anything over a 105" Wheelbase. It's interesting to think how cool it might have been for Glidden to have run the Volare....but Ma ran out of $$$ and went into Bankrupcy.