I don't know how well they know diesels, but ABEL RACING out in midwest city really knows their stuff, and I am sure Andre and J R could do you up right. or you could go through Power House Performance (they actually rent ABEL their space in the shop).
ABEL built my friend's 400+HP 2.4 liter nissan 240sx, and he drives it daily (or atleast he used to, he now has an F150 for his daily, the race gas for the 240 was getting a bit pricey)
these guys know their stuff. you can tell them John's friend Ken sent you there, they'll know who I am...anyway good luck!!