When you say 4-wheel burnout, what exactly is the goal? From the sounds of it, I'm sure the truck will have a lift kit and big tires.
If he's wanting to smoke them on the pavement you're going to have to go a lot higher than trying to chirp a set of 285s on a hard launch or spinning all 4 in the dirt. Is the truck a stick or auto? Does he want a streetable rig that he can drive around town or is it going to be a show queen? If it's going to actually be driven, what is going to be towed? Or is this a yuppie who has a diesel because he thinks it makes him look cool and rugged but never tows anything?
Also, if it's going to be driven does the customer want variable levels of power or one level all the time?
The first thing that comes to mind is the drive train. You're going to need some seriously beefed-up axles front and rear, drive shaft loops, one hell of a transmission upgrade regardless of trannie, and a new t-case that won't explode on you.
Injectors are like all new computer controlled injectors - expensive as hell but make good power. Swapping them out is probably not much more difficult than a swap on a 24-valve. You'll also want the biggest injectors you can get; Diesel Dynamics has them I think. Don't bother with a programmer. You're never going to get the power levels you need with that, since programmers have tunes that are suitable for a wide range of applications and trucks. You'll want to call companies like TST and Edge and see what they can put together in a custom package. You'll need dual CP3s to supply enough fuel to the injectors. The head will need to be pulled, fire ringed, and ported. Probably a cam swap too. I'm guessing a combination of propane and water/**** injection to keep the temps down to a semi-reasonable level. Definitely a set of twins with a lot of boost to go with the fuel being added and of course an upgraded exhaust manifold, intake horn, and larger intercooler.
without the big smokey burnout. either way i wish i had that guys bank roll to do my truck with 
