Replace engine, from gas to diesel

[Labatech]

Hi

I have a Maxum 2800 SCR from 1999, it has an 6.2 L Bravo MPI engine
I am thinking on changing the engine to a diesel engine.
Can somebody tell my how much HK (horsepower) I should have on the new Diesel engine.

(PS, I know I have to change the drive to X drive)