Generally I think as the rubbing block wears down on the points, the gap decreases and dwell increases, eventually the points burn from lack of gap. Did the dwell hold steady or bounce up and down ? You may have bushing and/or shaft wear, that will tend to decrese dwell. Good points and tight bushings should be good for 10,000 miles, if your check dwell ocasionally. Might want to pull your distributor ,take it apart and check it over. The cam can wear out also. A few companies make a conversion to replace the points so it still looks stock, but having said all that , HEI is still better.
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