Feeling generous...
I would buy a 24" backhalf/4 link kit. You could spend thousands building up a 9" or narrow a cheap 14 bolt. Another option if you want a little street legal action is a ladder bar back half kit. Google s&w chassis. Lots of good race parts at a decent price. They also carry cages. Probably gonna need a 10 point to be legal for your goal speed and maintain safety. Front end will probably be fine other than some fancy adjustable shocks. Cheater slicks for the road. Wrinkle walls for the strip. Your going to have a huge disadvantage with weight distribution. But a properly setup suspension will allow traction.
With the engine there are several threads on high hp builds. 5.9s are easy to build. With a light truck it shouldn't take more than 7-900hp to meet your goals. Go ahead and skip the single so you aren't replacing converters every other race. Probably will save money in the long run. Hamilton 188/220 would work swimmingly. 200/220 is you decide to turn up the rpms. Not needed though. Lose efficiency for high rpm power. 14mm pump is way over kill. Could be done with a 12mm, but I'd run a turned down 13mm rqv-k gov. Injectors will depend on pump. I'd say something in the 5x18-20 sac range. Forget the term propane. People will continue to laugh at you. Same goes for watermeth. You'll inject water at most. If you choose your turbos correctly you won't even need that.
I'm not even going to get into transmissions. Several threads on here regarding what works and what doesn't. Same for tech build threads.
Ps the dollar thing is no joke plan on spending at least 15k on the engine. 10k on the trans. 3-5k on the rearend. 3-4k minimum for chassis and cage work. 5-10k for misc coolers, hoses, accessories, driveshafts, gauges, shifter, etc. Read read read seriously. Otherwise you'll get run down so much you'll be scared of the green handled pump.