Speedo Gears

They go all the way down to 21 teeth... you will be able to get the right one

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No, they don't, and no, he probably won't. We're talking about the pre-'66 speedo drive pinions. They're much smaller than the '66-up pinions, and even when they were easy to get—which they haven't been for many years—there weren't many options. Smaller pinion diameter + coarser tooth pitch = very narrow range of available tooth counts. Specifically, the range with the pre-'66 pinions was 16 to 21 teeth (six options). Compare that to the '66-up range of 21 to 45 teeth (twenty-five options, that's over four times as many).

Perhaps the OP will be lucky, and when they pull out their speedo pinion, count the number of teeth, and multiply that number by 1.09 the answer will be within the range of 16 to 21 (likely it'll be halfway in between, like 17.44, which means picking a little fast with a 17-tooth pinion or a little slow with an 18-tooth pinion). Then comes the fun of trying to find the needed pinion; good luck.

OP, you may wind up needing a ratio box to get the cable to spin at the speed you need.