I disagree strongly on injector choice for that number but I'd plan on 15-20k in the block alone.
Throw in turbos, fuel system, HPOP system, meth, etc.... Knocking on the door of $25-30.
Then at 700HP your factory brakes are not going to stop the truck. So now you're going to start looking at swapping in 05+ (ideally 08+ because those brakes are huge). So factor in another 5-6k (you're 4 linking obviously). Then you're likely going to do a rebuild and and lockers so lets say $10k.
Then you're going to need a race grade tranny from BTS or John woods so that's another $7500 or whatever the going rate is now for RACE GRADE.
So yea, about $47,500 is a safe base number. You'll want some add ons and do-dads. So lets say $55,000.
Now you could do a budget build and do it much less, but how many runs down the track are you going to last? You could do a super single, lotta poorly atomized fuel, lotta boost and spray and make that number and it will last a while. But eventually it's going to go boom and you're restarting.
Welcome to the diesel performance world, I hope you have a 6 figure income.