Build all new cables from 00 gauge welding wire with soldered ends. I did this to my car years ago and never had a cranking problem again. I still even have the same starter after 20 years. Did have to replace the bendix once.
I had the same problem but in cold weather with my 69 fairlane. Cranked it so long the cables smoked and melted the insulation. Put in bigger cables in it too and never a problem again hot or cold.
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