"Use a delay-flash timing light". Set the delay dial at 35 degrees and align the ball with the pointer by turning the distributor housing with the engine running at 2500 RPM. It would be a good idea to find true TDC to see if the ball is accurate. Some engines have the ball in the 5 degree advance location. PM me if you want and I'll detail a procedure for finding TDC using a spark plug shell with a piece of round stock welded into it called the "positive stop" method.
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!