I have a 1973 amc javelin, its been sitting (inside) for 28 years. Trying to get it running now. Replaced all the ignition system, just need to know how to set the points.

The point gap for all 1973 AMC engines is .16 inches. If you have access to a dwell meter the dwell for the V8 is 29-31 and the dwell for the 6 cylinder is 31-34.
To set the points you need to turn the engine over until the contact pad on the points is on the center of a lobe on the distributor. The lobe should be in the center of the pad so it's probably best to turn the engine over by hand. Loosen the screw on the the slotted hole in the point set and slide your feeler guage between the contact pad and the lobe. Be sure the feeler guage is flat on the contact pad or your measurement will be off. Tighten the screw and slide the feeler guage out. It should fit snugly and be able to slide back in easily but snug.
Turn the engine over until the contact pad is on the flat part of the lobe and check the alignment of the points in relation to each other. They should be closed with no gaps at either end. If there is a gap at one end then bend the stationary support until they close. DO NOT bend the moveable arm. Reset the point gap after you bend.
Once you have the gap set re-check the gap. Quite often the gap will close a little when you tighten the screw .It takes some patience to get the point set properly.
Hope this helps.