Turbo 383 in a A-body Barracuda

Mad Dart said
Do you have a goog ground strap from the engine to the body of the car? I hook my leads directly to the battery. You may be loosing ground at cranking is another guess. Try grounding directly to the battery.
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Yep!
One from the battery to the engine block, one from the block to the firewall and one from the block to the wiper motor stud.