There's no single "point gap" for a 1972 Ford 351 (assuming you meant 351, not 330, as there wasn't a 330 cubic inch Ford engine) The correct point gap depends on the ignition system used in that specific vehicle. The gap is usually specified in the owner's manual or a Ford shop manual for that year and model.
You'll need to find the correct specification based on the ignition system your car is equipped with. It could be anywhere from 0.016 inches to 0.022 inches, but again, consult your owner's manual or a Ford shop manual for the 1972 model year and engine for the precise gap.
