Bob---It would be far better to get the car running well before
complicating matters with an after market ignition.
My interpretation of "phasing" is to be sure the tip of the rotor is
right at the center of the distibutor cap's tower on the spark plug
that's supposed to be firing. This can be determined by turning the
engine over to where the crank pulley mark is right at Top Dead Center,
#1 firing. At this time the rotor should be right at the tower wire that
carries spark to #1 plug. Should the rotor be between two of the towers,
the spark will have a choice of which tower to send the spark, taking
the path of least resistance. The result would be an engine that
sometimes fires at the wrong time, causing backfires and misfires.
Excess slack in the train that drives the distributor rotor would be one
such cause of being "out of phase". This might show up when using a
timing light as a large variation or bouncing in timing. Check this at
various rpms.
Dick
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