Back in the middle 1960`s I dropped the 312 into the 55Tbird and converted the electrical system to 12 VOLT Neg ground. Used a Ford 12 volt gen I bought.

I HAVE NOT used the 12 volt starter I bought at that time. AND I NEVER HAD TO. That starter is still on my garage floor.
This advice to limit current flow to the starter by changing battery cable size is beyond my comprehension. That is not how electricity works. Larger cable = lower RESISTANCE,
lower heat MORE ELECTRICAL ENERGY delivered to the starter from your battery.
On another car OLDS, long gone I had hot start issues until I retarded the ignition timing at engine cranking to start. Then at cruise NO LOAD the ignition timing approached 45 degrees BTDC
and I would run it like that until I had another CA SMOG check ( every 2 years ) This was MANIFOLD VACUUM not ported vacuum. RAN GREAT. Pete