I dont know much about the hp numbers but i belive what you are after is easy with a p pump with just the basic mods. You can p pump a 24v but you will not be able to " program " it. The conversion is expensive pumps alone are around $1000. Then lines injectors, covers ect.

As far for the auto transmission they barely hold up to the stock torque As soon as you put a screw driver to the pump you will kill your trans. Manual trans will hold up better. But are harder to find. I went with a devorced set up so i could use any tcase and axles i want down the road.