Odd shifter problem, need advice

Not to throw a wrench into this scenario, but I have run across 3 different pin spreads on the A-body pedals. My Demon has the 5.25" spread, and I have no problem power shifting at 6,000 RPM with a mild SB. Even has the larger 10.9" clutch disc.

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What years cars used 5-5/8”?