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The A engine isn't all that much larger. The bore is about 1/8" larger and the stroke is 1/4" larger. 177 CID for the T and 200 CID for the A. The A can be adapted for transmissions more easily and has a better distributor set up plus a fairly decent oil pump.
Ford even used the little 120 CID 9N tractor 4-cylinder flathead motor in 1941 pickups but that didn't go over too well. They only have a little more HP than the model T but they are smaller too.
4-banger motors from Chevrolet are harder to find now days. A lot of the old wood body cars didn't survive the WWII scrap drives. Dodge brothers engines are also likely not as easy to find.