Reverse polarity means the wires at the pick-up are connected to the wrong pins inside the connector.
But STOP!
the proof of reversed pick-up polarity, is the severely wandering spark strobes, and the engine does not take throttle well at all . . . . . because the spark really is jumping around. So don't go swapping the wires until you have proved the rebellious strobing.
But if you do have to reverse the polarity due to crazy strobing, then you will have to reset your base-timing. And,
if you re-phased your rotor to get the spark to jump to the right towers, then you will also have to change that back.
But hang on a sec;
Did you not say you had a mild 360; why is it idling at 1100@14 degrees? She is either way up the transfers, or she is sucking a lotta bypass air, and for a mild cam that is all wrong; and a 300 rpm drop going into gear is crazy! No wonder it won't hot-start.
What cam is in your engine?
My old 292/508 /108 idled just fine at 700/750 and pulled down to 550 in 2.66 first gear, with 3.55s. (4-speed)