you really want a dieselThey are great little tractors within their limits of power.
I sometime miss the 1942 9N i rebuilt. Bought the tractor not running for $500, rebuilt the engine, replaced the carburetor, exhaust system, rewired and converted to 12 volts and upgraded to an altinator, along with the ignition system. Replaced all four tires, and repainted it.
All total, had about $1500 in the tractor including the cost of the tractor and the used brush hog I bought for it.