A lot of them were rated at 4,000 and although they would blow up if you ran them that hard, that was a false hp rating in my book. The 235 was rated at around 30 TAXABLE hp. --- they were great engines and we had a dozen of them that were from 53 to 62. We never ran them hard so they did great for us.
If you put a different engine in, all the clutch/bellhousing stuff never works. My 190 runs at 2200, but I never run it more than 1800, anything over that the motor don't sound so good, (overspeed) so factor in the max economy speed and gear vehicle according.
On a side note my f-350 diesel runs at 50 mph with engine right on 1500 rpm. engine sounds good, and it gets 16 mpg at that speed, so you have to match rpm/torque to get a balance point for the engine. Whatever you use needs to run at a mid-point so it dont blow up. Overspeed is the biggest killer of engines.---just watch tractor pulls!!
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