The stock turbos from an 86/87 will support more than 700 hp. It really depends on how much power you want to make. The rest of the engine will have to be able to handle that kind of power. Check my posts for my twin turbo set-up that I built. One on each side is typical, but I wanted to keep the AC/power steering, ect. I also wanted something different. So, I also went with twin throttle bodies, twin stock intercoolers, and dual fuel (methanol and gas). The car runs 126mph on 19 lbs of boost. I am just getting the bugs worked out right now, and the weather is setting in. 
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All it takes is time, fabrication, a willingness to live in the garage, have a TIG, chop saw, MIG, angle grinder, mandrel bends, beer, aluminum, hose/fittings, electrical wire/connectors, Vodka, plasma cuttter, complete tool set, tube benders/flaring tools, Rum, tap&die set, gloves,vicodin, Neosporin and an understanding wife.
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