Not knowing what needs done and just a phone call, I'm surprised they put a price on it. I never have a real idea of costs until the block is bare and the knowledge of what I found on teardown. I guarantee they'll probably rebuild it for that, but it will be their budget build. Using the best parts and doing everything to precision will cost. We do everything except the machine work and after the block is cleaned, magnafluxed and sonic checked, we make all the decisions on parts, and machine work. That said my basically stock builds including head work run 4-6K. Two things you have to pay for are quality parts and machine work.