If you don't have a timing light, hold it at 3K RPM and rotate the distributor counter clockwise slowly. When it stumbles, back it off a hair and tighten it down. (do this procedure with the vacuum advance hose off and plugged.)
It's kind of a redneck way of doing things, but it will get you close. If the car starts hard after doing this, back it down a hair. I've done this at the track in a pinch with no tools and had good results. Why 3,000 RPM? More than likely that is pretty damn close to where your total advance comes in.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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