I'm an exception to the "normal race car" as I use efi and coil near plug, but I ran my battery ground from the trunk to the engine block 00 cable like the positive. Mostly for ground loops, but helps with cranking too in my opinion. Also I use 6° advance for cranking timing all the time whether on gasoline or E85. I switch back and forth at will. Try the 20° retard before throwing money at it.
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'65 Tempest 467 3650# 11.30@120.31
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