I don't know of a FAQ or anything about replacing with the spring kits.
FWIW, they look pretty straightforward - should bolt right in. Those are pretty ancient forks, come apart easily, without a whole lot of bushings, little snap rings or anything that requires extra special tools.
I had a pair of Manitou 2's or 3's when they were first released and was always splitting/breaking the bushings.. but, I was also experimenting a lot by trying to stack more elastomers inside and other things to get more travel. I would have loved to have a spring kit in them at the time (Now I'm happy with my Super T's!). In fact, if I ever get around to finding and building an old Manitou frame, I'm going to try the spring kit.
Here's a link to some replacement springs I saw on ebay that should fit your Judy:
http://cgi.ebay.com/Oil-Cartridge-an...3%3A1|294%3A50
I cannot vouch for the product or the vendor - but at a glance these look like a good idea if you plan on using that fork more than once or twice a season. Or course, I'd ask the seller lots of questions about installation and all that beforehand. Hoe that helps!