Hi Lazy Ace, here are instructions for setting the points,the gap is .017" except for the high performance motor,that is set at .020. You can set the gap .001 bigger as they tend to close up slightly due to the rubbing block breaking in. Put a match head sized dab of breaker point cam lube on the distributor cam. Thanks for using Just Answer,have a great weekend,Jerry.
Setting the Point Gap: Getting the best gap between the points is essential for proper engine performance and reliability. Set the points too wide and the spark plugs don't get enough juice. Set them too close and the engine works fine for a few miles... until the points are burnt beyond use.
Most cars had a point gap of about 0.019", or the thickness of a matchbook. Some were set higher or lower so check your manual to be sure. To measure the point gap, you need a set of feeler gauges. Adjusting the point gap is a simple process, but it takes some practice to get the hang of doing it properly. First, make sure the rubbing block is on the high point of one of the cam lobes. If it isn't, you will have to turn the engine a little bit in order to turn the cam.
Once you have the rubbing block on top of a lobe, you can measure the point gap. Loosen the screw that holds the stationary point bracket to the base plate. Not completely, just enough so that you can move the bracket by inserting a screwdriver tip and twisting it Adjustment is a matter of trial and error. Move the stationary point out a bit if it was too close, tighten the holding screw (not too tight), and measure the gap. If it still isn't right, try again. The feeler gauge should have a light drag when the points are properly adjusted. This is where practice and patience comes in handy.
Auto Mechanic
Mechanic with over 30 years experience with N.Y.P.D. fleet service division