frame-might as well go with a custom tube frame(if you are putting on an 8-71 and running nitro then money is no object) instead of beefing up something that is 20something years old
rear end-expect to shell out a few paychecks for either a custom built currie or to have a stock 9 inch built up for you
transmission-get used to waving goodbye to your wallet cuz this is gonna be a pricey item too
suspension-go with a good 4-link for the ultimate in control
driveshaft-expect to pay a couple hundred for a custom-made driveshaft that can handle that amount of power
bushings/nuts and bolts-everything will need urathane bushings and when you start adding up everything else you will need and the amount of shops you will be visiting in the end it wont be worth it. in my opinion, build whatever motor you want up to 550 hp and stuff that in a ranger, that will be more fun and broken parts than you can handle. trust me, im speaking from knowing a guy with a blown 460 making 800 hp in a purpose built, tube framed,4-linked 100,000 dollar race truck, you wouldn't believe how much more time he spent repairing broken parts vs. driving it( not too mention how much he spent on it). once you bolt that blower on you step up into a completly different ballgame.make sure you are ready to pay to play.