:rolleyes: how do you gauge points set 350 motor

Rotate the engine to Top Dead Center and with the distributor on the highest point of the lobe, the air gap should be .015 - .021" That's point gap, only... The best way to set the ignition for proper coil saturation is with a dwell meter. This takes practice not often found today.

Picture the thickness of a matchbook.
Old Hat: the old fashioned matchbook had an appropriate gapping thickness and the striker could be used to burnish the point contacts.