Nice score! Bows low

1. No, but there is an excellent utility called TattleTech 2.84 http://www.tucows.com/preview/207028

2. Replacement depends on where you are. For me, in the great southern land. Little chance.

3. See above

4. All 19 of them! http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English-North_American/Macintosh/System/Older_System/System_7.5_Version_7.5.3/

On a side note macmetex has 33mhz processor's for $1 plus shipping.

http://cgi.ebay.com/Daughter-board-processors-66-33mhz-520-540c-PB-Apple-/310280296274?pt=LH_DefaultDomain_0&hash=item483e259752

I installed one in my 520c and it is definitely zippier.