To find the correct point gap, you must consult your vehicle's owner's manual or a reputable repair manual specific to your 1976 Dodge 440. The manual will specify the correct point gap based on your engine's ignition system.
Generally, point gaps are in the range of 0.035 to 0.045 inches (0.89 to 1.14 mm), but this is a very broad range and not guaranteed to be correct for your car. Using the wrong gap will lead to poor engine performance, difficult starting, and potential damage.
In short: Do not attempt to set the points without the correct information from your vehicle's service manual. Using an incorrect gap can seriously harm your engine.