You would think the Catalina website would have that info available free to download.
They don't. They sell boats. New boats. They even take the old ones off their website when they stop production. Too bad, lots of lost historical stuff, but just remember, they aren't in business to keep up a website, however disappointing that may be for some of us.
That's why the OWNERS' ASSOCIATIONS have been soooo helpful to skippers.
As far as what you need to know for going back or learning about the OEM setup of your boat, that "partial" manual should be more than enough for rigging basics. After all, the boat is simply "simple." Forward and aft lowers, shrouds, forestay and backstay. Some have split the off-center backstays, we never bothered, although I did on our C25.
I've found that the most helpful part of ALL of their single spreader masthead rigged Catalinas has been their rigging/tuning guide. For those who can do it without a LOOS gauge (or two, since the gauges straddle the two sizes of rigging on most boats!) the Catalina Tuning Guide is one of the easiest and best I've ever read (including the oft-linked Selden rigging guide, which is much better for fractionally rigged or multiple spreader rigs).
If you can't find one for a C22, please know they are ALL the same. You can try the C22 Association website, the C25, or our C34 manuals (scroll down to rig tuning:
http://www.c34.org/manuals/1988/1988-C34-Owners.pdf). I've been using this successfully on all of our three boats (22, 25, 34). It works.
It's also in Bilbo's post and link.
The only other "complicated" piece of machinery on the boat is the swing keel. I am pretty sure the C22 Association website, in addition to this one, has pretty good information. If not, ask over on the C25 Association website, since many of those skippers had C22s and can head you in the right direction.
http://catalina-capri-25s.org/forum/forum.asp?FORUM_ID=3
The C22 is a great boat and we loved ours for many years.
Enjoy.
PS - The CD Handbook has a lot of good mods that owners have made and CD has followed up with documenting with their hardware. It's worth it, if you're interested.