I think you got a good find. I've always liked the "pizza box" Macs, have 3 LC IIs, a III, a 475, and a 603 (?, the last 2 have 68040s). I didn't know there was PPC version.
OS 7.5.5 is great for all I do and it's free. OS 8 and 9 might tax your hardware.
Have you been to
http://www.pure-mac.com?I have wired-in 2 AAs to replace the system battery. It's not pretty, but it works.
