Sorry on the run...mental lapse.

So on start still just a bit over 9 volt. On run, 7.8 volts.

I already took the ground cable off the block earlier today, chased bolt and threaded holes, all paint off the manifold and cable in the contact area. Show 0 loss from battery to manifold bolt.. Radiator support ground is clean as well.

I have three coils I can swap with. I started with a resto coil at 1.9 ohms primary and 10.1K ohms secondary, The one in there now from this morning is 1.5 primary and 9.8 secondary...it is the one that came with the car, looks like an old NOS unit, I just swapped it back in. The third is a resto that I haven’t yet done anything with and is 1.8 primary and 10.1 secondary.