Nobody can really answer this question because it so DEPENDS... depends on the base car quality - and what has to be done to it - floors? Wheel tubs? Rust repairs? How well do you want margins to be? Does it need stripping and full paint?
THEN you start with the drivetrain -- Motor? trans? rebuild or new? Fuel Injection? Turbos? Pro charger? Big block - or LSx? How much bling? New radiator and core support?
Front clip -- use the exisiting one and new A arms etc -- or start with trick clip and all the goodies?
Rear end -- rebuild exisiting or all new trick stuff...
Tires and wheels -- THEY can be had reasonable OR you can spend 6 or 7 grand...
Interior alone can cost 20 grand... new gauges - new seats - harness - wiring - all leather and trick stereo - and Air conditioning and on and on.
So you see why it's hard to answer the question.
BUT -- I would say you're going to spend EASY 150,000 USD to have a real nice build with some goodies and interior etc... MORE depending on the base cost and how fancy you get.
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