I'm no expert on pulling or the 44-6. I do however a bit of experience with the 44-6 engine (the Continental F226 flathead) in industrial applications.
The F226 is a good engine for what it was intended for. However on account of it's sidevalve design it has "breathing" (and thus power) limitations. And in the 44-6 tractor, breathing is further constrained by the stock manifolding and carburetor.
That said you should be able to crank it up to 70 - 80 HP by replacing items such as manifolds, carburetor, possibly camshaft and distributor with those from an F226 set up for automotive use. (The F226 was used in the mid/late 50's Jeep station wagons; also in Checker cabs). Also you'd need to turn up the governor from the factor high idle of 1,800 to around 3,000 - 3,500 RPM to get that much power.
That said, I gotta agree with Traditional Farmer below - that the 4 cylinder MH 44 engine (larger displacement, longer stoke, overhead valves etc.) is a better candidate for a puller engine.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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