Torqueflite Speedometer gear choice

Larger? :D
in my post I went back & forth on which way (larger or smaller) was right for my line of thought & I'm thinking a smaller one would make the speedo turn faster, overdriven (read higher) & say for instance, show 68 when you are actually going 65 so you would then slow down a bit as opposed to a larger tooth one that would turn/read slower & show 65 when you are actually going 68 & you would think you were legal when you're not.
Just go by the chart. There is no point in getting real fancy measuring tire roll-out, tire growth at speed (what speed, 200 mph?) etc... when in the end we all know that the speedometers are not too accurate to begin with, and that you'll always end up "rounding off" to the closest gear anyways.
I always get fancy/complicate things, YMMV.