I remove the distributor and rotate until the points are at the widest opening. Then using a .017mm fueler Gage I set the point gap. Reinstall the distributor, set timing and roll!
i always had a meter with dwell on it you adj your points base and keep the gap the same Addition to above: Haven't messed with a points ignition in quite some time, but still have a Sun distributor machine and remember how to do it, if it's a dual point distributor the easiest way is to block one of the sets of points with a matchbook cover or thin piece of cardboard in between the points and set the dwell on the other set, then put the matchbook cover between the point set you just set the dwell on and set the dwell on the other set, then remove the matchbook cover and your done. If you're doing this on the car (as opposed to doing it on a distributor machine) you should then re-set or at least check the timing.
if you googlehow to set points on distributer the first answer is correct, with the cam lobe on the shaft opening the points it should open to 17 thousands
If you set the points at 30 degrees you will be fine.
If you have a dwell meter set the points between 28 and 32 degrees, I usually set them right at 30 degrees.
your distributor is not set right. its probably in backwards by 180 degrese
A 1983 engine doesn't have points, but if you have changed to a points distributor use the same timing settings that were used with the original distributor. if you can time an engine with a hei dist. it's the same way with points. you have to use a timing light, and turn the dist. to retard ,or advance the timing. If the engine has been fitted with a GM type distributor there should be an access door to the side of the distributor cap. Use a "dwell tach" (with the engine running) to set the dwell, then use the timing light to set the timing. If it's not a HEI ignition then it's safe to assume that it's not EFI either so you'll set the timing by loosening the retaining bolt at the base of the distributor, then turn the distributor to align the timing mark with the amount of advance indicated for your altitude. The timing light will cause the mark to appear that the dampener pulley has stopped and you will be able to move the mark as you turn the distributor. NOTE! When setting the timing always remember to disconnect the vacuum line.
there is a Allen head screw sticking out of the distributor behind the slide up door that adjusts the points, you need a dwell meter to set them properly.
There is a window in the distributor cap. Just inside it there is an adjustment screw for the points. You will need a dwell meter to adjust them properly, the dwell should be set between 28 and 32 degrees.
0.19 for brand-new points 0.16 gap for used points. The above answer may be adequate to get the engine running, but points are set correctly when you have a reading of 30 degrees on a dwell meter.
Reuse your old 305 distributor.
This truck DOES NOT have points!!You would have the standard rotor cap and distributor for electronic ignition.Just buy new cap/rotor install and DONE.Points have not been on vehicles for YEARS.