Car won't start suspect it's in ignition

I'm trying to help another member get his car going again, it won't start.

It has a mallory distributor and msd coil.

It seems like it's not getting spark all the time, but only after you stop cranking, it sputters.

We tried to check for spark by putting a spare plug on the end of a spark plug wire and holding it to ground, and it's not sparking during cranking, only when we let off.

We seem to be getting weak spark out of the coil.

Here's the car:

View attachment Eddie Dart A05 B.jpg

View attachment Eddie Dart A08 B.jpg

We're getting 12.465 static volts across the battery. Here's the ballast resistor, it has 10.28 coming in and 3.08 coming out:

View attachment Eddie Dart A14 B.jpg

On the coil here, we're getting 2.93 on the positive side, and 2.05 on the negative side with .87 across them.

The stock coils that I have checked usually are around 6 volts, this seems kind of low. How do we isolate where the problem is?

View attachment Eddie Dart A17 B.jpg

Here's the distributor:

View attachment Eddie Dart A15 B.jpg