Replacement vacuum advance can for 318 distributor

Set the transfers slots a little more than square, airscrews to 2.0 and started tuning, same issue with idle. really rough and the timing mark jumps everywhere. Timing smooths out at higher rpm and mark is steady to confirm all in, it just wants to vary by like 5 degrees at idle. I don't think its the light. Pulled a couple plug wires and spark was very weak, no clicking sound. Didn't make much difference to the terrible idle.

So definitely an ignition issue. Checked the coil, was very hot and resistances were 11.2k and 1.1... pretty sure it is supposed to be 1.5 ohms. going to swap and old coil in and see what it does.