1971 slant six 225 no spark or weak spark at plugs?

Lots of things to check, thanks for the suggestions.

I just put a spare battery on the slow charger, and we'll see what it looks like when I get home from work. I also can use the known good battery from my daily.

I'll also check the voltage at from the battery positive while cranking and see if it matches the voltage at the positive coil while cranking.

I have a solid connection from body to battery. I did paint the power steering bracket and engine, and the negative battery cable goes to one of the bolts that holds those together, so I'll have to check that too.

@67Dart273 I will try your suggestions too thanks.