I wouldn't do it on a nice car like a 370. Ditto for something you're going to expect to perform flawlessly at high speeds and under high stress (lateral G's, hard braking, etc). My frankenstein Jeep is one thing; I don't care that all the panels aren't aligned perfectly, or that some of the gaps will never be quite right, or there are still wrinkles in the transmission tunnel, or that I had to replace the front right quarter with the under-structure from another Jeep. On my Z that would drive me nuts.
On a track car I wouldn't care though, since chances are I'd be replacing most of the suspension and repairing the body multiple times anyway.
Save up some money and look for a great deal on a clean used 370 sport/touring that was maintained well. Budget another $2-3k for a beat up Corolla or something to haul people and $h*t around in, and to drive in crappy weather when you don't want to mess up your Z. You'll enjoy your Z more if you aren't forced to drive it every day.