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What’s the voltage from the large alternator stud to ground? You might have a bad fusible link

1/8 spade connector - Google Search

Apparently I missed the part of you replacing the Negative battery cable. Did it attach to the engine and body?

Temporarily hook up jumper cables from your engine to the chassis. Temporarily hook up jumper cables from the negative battery post to the engine....

Sounds like a bad negative battery cable.

DVM on Alt stud and battery Negative Report back

Eaton 14-Terminal Ground Bar Kit-GBK1420CS - The Home Depot OP, I’ve used a readily available “Ground/Neutral Bar” from HomeCheapo. Use the large lug for your feed and the smaller set screws for your circuits, add another large lug at the other side for your starter wire if needed. This setup...

VR or bad VR connections....

The heads look like they are O-Ringed, that would help in a boosted application.

:drinkers:Pro: Changing 16 plugs gives more time to consume beer!

:dontknow: I think the dual plugs had some issues with dual 'flame propagation' causing problems. IDK, something about the flame fronts crashing into eachother .

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