I'd say 8 grand would be fair. And if you did buy it why not just order up a nice Arrington 426 Stroker motor for it. Heck I bet they could walk you through the process of replacing it. If not could recommend someone to do it for you. Bet for 15 grand you could have a bad fast ride. For 5 grand I would definitely buy it as that would be a steal of a price.