'I'll put some links below that have various download sites. One of them ought to work for you. I would probably add more memory to the 486 though. At the prices today it is easy to afford enough memory. The hard drive is a little small. You could find a 540 meg on ebay for about 15 dollars.
This one has links to a bunch of distributions.
http://www.cnet.com/Content/Reports/Special/Linux/ss01.html
This should be a useful link. It has all the how tos.
http://metalab.unc.edu/LDP/
Iron temple--
http://www.geocities.com/Colosseum/Arena/9278/
