The best you can do is to put a ohm meter between the wire coming from the points and ground ,after you have the rotor aimed at the # 1 spark plug wire ,and the timming marks lined up ,ball on pointer, also you have to make sure your on the compression stroke of #1 cly.take the plug out and put your finger over the hole when you feel the air pushing on your finger start looking at the pointer and line up the ball.Take the wire off the coil that goes to the dis. put an ohm meter between that wire and a ground ,move the dis. one way and the other untill the points are just opening the ohm meter reads 0 that will get you close enough to start than you can hook up a timing light and set the timming to spec.
Pete
