uk soon to be owner needing help
 

so im going to be doing a cummins 12v engine conversion on a landrover defender 90 if you know what one of those is a small pick up compered to your bests i know the conversion can be done and how to do it but looking to tune the engine up wanting to get 500hp at the crank i have done some research and just need some help dnt understand all the terms so could do with in fo how to do it and what parts want it to be reliable hope to hear from you all thank you for your time