It's a lot simpler to set the timing with the engine stopped, then check it with a good, very bright timing light. Align the pointer and ball by turning the engine by hand, then turn the distributor clockwise until the points close. Turn the ignition switch to the "on" position, and touch a test light with the clip attached to a good ground to the (-) terminal of the coil. Turn the distributor CCW until the light comes on. The timing is set- - - -lock the adjustment down and crank the engine up. You can check your work with a timing light if you choose, but it's not really necessary. Minor adjustments up to about +/- 5 degrees can be made with the octane selector.
Jerry

Edit: OOPS! Just noticed you've got a Pertronix- - - -no help there on the static timing! Just another good reason to stay FAR away from that system!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!