[jhv48]

Try reducing the idle and see if that cures it, 950 -1000 is pretty high for that engine. My 427 roush idles at 850 just fine. When I had it at 950, it ran on occasionally also.

A hesitant starter can be either a low battery, weak starter, poor ground or too much (or too little) initial timing. Your numbers seem fine, but try backing off the initial timing a few degrees and see if that helps. If not, try advancing it and see if that does it. If no change, then have the battery checked.