stumped!

Bad Sport said
Line the rotor up on #1 on the cap then look at the tab that drops into the distributor gear.

Are they pointing in the same direction?

After a little more digging, what I suspected the issue was, is what I thought.

The rotor and the spade where it drops into the distributor drive gear are clocked differently than a factory distributor.

You need to either move the distributor drive gear or the wires around the cap to make it run.

I would move the gear and keep the factory firing order on the cap correct, but either way will work.