I thought about a mini starter for awhile, but ended up going with a Powermaster 3655 OEM-Style High-Torque Replacement...
https://www.summitracing.com/parts/PWM-3655
If that doesn't work, I would probably opt for an IMI or RobbMC.
BTW...also picked up the RA starter solenoid shield and battery cable insulator tube (and 1g cables) for insurance.
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1970 GTO (Granada Gold) - 400 / TH400