P38 trouble ,can any1 help ???

To any1 who can help me ....... Lol

Hi I have taken the engine out my p38 diesel due to a head problem and can't find a good second hand one to put back in, they all have super high miles on, if I put a 525 engin in what do I need to change on the fuel pump, can i swap the elec part of my pump wit the elec part of the 525 pump, as I don't want to put the old pump in cuz its pretty foooked as well.

Thanks again