OP,
For parts, Jerry's Gaskets (a ZR-1 owner and forum member) has a nice selection and comes highly recommended. You can get an idea of pricing, too, for what needs fixing. e.g.,
http://www.jerrysgaskets.com/fuel-pu...ssy-90-95-15a/
BTW, the original gatorback tires that are on that beauty could easily be sold and likely break even on replacing tires. ...or kept for show or resell.
Nothing like a Porsche Turbo (996 or later) for putting the power down for acceleration. But there's nothing like a ZR-1 for laying an eternal double stripe from a stop (among many other things).
All the best in your endeavor,
G