Welcome to the site, and NICE FIND! Glad to see one that is still mostly original. Check out my 505 resto thread should you need any tips, tricks, or pictures. Mine is not original in the least but it still came out nice.
http://www.vacuumland.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?34158_27
Sad to see how the belt lifter was 'fixed'. I fixed mine with screws but at least did it right and saved it.
Keep this thread going - after restoring 5 Kirbys, I want to watch now rather than do! 
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