You should be able to get away with a 2 to 3 hp electric motor because that HP rating is for continues use but the peek HP rating tends to be much higher and on top of that it's not as easy to stall an electric motor very easily, instead of stalling they tend to put out their peek Horse Power!
I think the GE electrac garden tractors have a 6" motor on them and that seems to be around the size that most people tend to go for when converting as well.
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