MSD issue

I fired up pops car today, fired up nice. I ran it for a few to check for leaks and shut it down.
Now no spark at the plugs. The coil is firing but no fire at the plugs.

What do the 2 wires into the distributor even do? I would think fire INTO the cap should equal fire OUT of the cap?

I've just about had it with MSD. I though I'd ran into every problem you could have with there stuff but this is a new one to me.

The box is new 6AL digital, distributer is new pro billet, wires are new and coil is new.

Any ideas why it would just stop sparking at the plugs? When we were cranking it I went to pull some timing out and it shocked the piss out of me then nothing.