You don't need a timing light. Just roll the engine over by hand (clockwise from the front)until the BB is under the pointer with the engine stopped, loosen the timing clamp, turn the dizzy clockwise until the points close, and turn back CCW until they just barely open. Lock the clamp down. The timing is set close enough to run without any problems. You can tweak it a tiny bit up or down from there for the best power and least detonation.
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!