For reference, the correct formula for horsepower, which is in fact a calculation derivative, is: HP = TQ x RPM / 5252.
An engine with 1625HP @ 3200 RPM has about 2660 ft/lbs of torque at that RPM.
Built for racing, in unlimited hydroplanes, the same basic engines turned about 6000 RPM and made about 4000 HP, that's about 3510 ft/lbs of torque @ 6000RPM. Maximum torque would probably be close to 4500 ft/lbs, probably around 4000RPM.