Not positive but I believe industrial engines were cammed differently from car/PU engines so torque peaked at a lower RPM. They likely had different carburetor jetting (or more likely completely different carbs) as well. Depending on the application they also had different (larger) oil pans, larger radiators, different alternators, etc..
Adjustable speed governors were Pierce or Hoof mechanical. They were belt-driven from the fan/water pump pulley. Limiting speed governors were King Seeley(?) velocity type - essentially a 2nd, speed sensitive throttle plate - bolted between the carb and the manifold.
Depending on the application industrial 225's were rated the 70 - 80 HP at 2,000 RPM. By comparison automotive 225's were rated for 145 HP at 4,000 RPM thru the early 70's. This had dropped to 100 - 110 HP by 1972 as smog controls were added.
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