How to set breaker points?

Sounds to me like you did not use the little capsule of grease for the rubbing block on the points. Get a new set of points, replace the old ones, set to .014-.016 clearance and grease the point cam lobes with the capsule of grease that comes with the points. If you put the new points in dry the rubbing block will wear out in no time flat and you will have issues like you are describing. 360s like 3-5 degrees if initial timing. If there is no capsule with the new points white lithium works just as well. Don't get in a lather about a dwell meter. Chrysler points are not adjustable with the engine running, they are gap and go. Hope this helps.