I've been having some some problems lately with my 283. It has been misfiring at times, and left me on the side of the road the other day. I have recently installed new points, condenser rotor, distributor cap, coil, spark plugs and spark plug wires, but it is still acting up. I just noticed that the dwell angle is not constant. It ranges from 27 to 30 degrees at idle.

I guess I need to replace the distributor.