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 - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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