No start on rebuilt 360LA

Correction to description(I showed my idiot card) it’s a MSD Magnetic Trigger, Mechanical Advance (part # MSD-85345)

**Update car is still backfiring, but after attempting these fixes, a new issue arose. When we set the timing as previously stated, we let off the ignition push button and the car kept cranking on its own. I had to pull the battery ground off to get it to stop.