It is really a job. If you take off the head and you do the installation yourself you could probably get the job done for 50-125 bucks less.
I got my block bored .020 over got a high comp. wiesco piston, hot cams cam, port&polish and a valve, valve guide, valve seat, job for 600-650 bucks, but that is because that is all i took them the job would be alot higher if you give them the bike and make them disassemble and assemble it.