What Are You Doing To/With Your Car Today?

missing linc said

Yeah, I have tried that last year, with the MSD distributor still in it. I swapped out that distributor for a stock Chrysler one as I don't know if anything had been modified on it. I will try the vacuum gauge again, may be working on it again today, see how the day progresses.

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I pulled this from google, but it sounds right going by memory. And I am getting old LOL! anyway you do this for a quick timing when your damper mark has slid and a timing light wont work. This is better than "timing by ear". I had seen some peoples timing by ear that was way off. LOL!
Get a vacuum tester and put it inline with manifold vacuum. Advance the distributor until you get the maximum amount of vacuum reading on the gauge. Then turn the distributor back exactly 1 degree on the vacuum gauge. Tighten everything down and adjust your idle if necessary.