Mark,

re: "...If it does not line up with the zero then with the light dialed in to whatever amount of timing you want you then twist the distributor until it is aligned with the zero mark and lock it down...."

Just to clarify your answer (above) for John, isn't it true that if he gets a '93 (as he wrote he was planning), then rotating the distributor won't do much (except a gross misalignment will just stop conducting the spark's power altogether) because ignition timing isn't done in the distributor but, rather, at a flywheel sensor instead?
Please tell me if I'm right about this.
Thanks.