69 C10 no spark IT NEVER ENDS

[JFC10]

Hi all

Sorry to bother everyone with yet another question, but this forum has been very helpful. This is after installing the 350 back into my '69 C10...

I have no spark from my stock rebuilt points distributor. It worked before I pulled the engine, it was running.

Using a multimeter, I have 12 volts at the + post on the ignition coil. There is a yellow wire and a black wire on that + post.
I also have one black wiring going to the distributor on the - post of the coil.

I replaced the ignition cable (distributor to coil) and checked all the plug wires.
I replaced the ignition coil with a $15 chinese one.
I adjusted the points gap and can see it closing all the way and opening as the engine is cranked
I cleaned all the little leads where they attach to the coil and in the distributor
What could be wrong?

I know the ideal solution is to just get an HEI setup, but money is tight, I might just be a 19 yr old working out of his parents 3 car garage...

Is it possible that the black wire from the coil to distributor is fudged inside? The coil may have hung from it during teardown...
Any help is greatly appreciated thanks