Are you looking for just machine work to parts you are going to collect and build or do you want to drop off an engine and get a fresh one back?
Also, how deep do you need to go in that 550? probably cheaper and wiser to just find another one, like this one (not mine)
http://sfbay.craigslist.org/sfc/mcy/2803553888.html
Honda CB550 Motorcycle engine - motor - $275 (Downtown Sacramento)
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Date: 2012-01-16, 5:30PM PST
Reply to: see below [Errors when replying to ads?]
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Honda CB550 motorcycle motor - engine. I original got this for parts but have never used any. 1970's decade Honda Motor
There was oil in the engine when I got it, but not sure how much. Great for your Cafe Racer project, or stock projects.
I don't ship, if you buy it bring a friend or two to help lift it!
Call if serious: 916-871-2892
Located close to downtown Sacramento