You could try totallyalfa; he does the Alfa specific tools you will find make the jobs easier. Sorry, don't know how to do a link! He is based in Devon, if I remember correctly. If you want a manual, try Mercian manuals or go for a cd rom off eBay, and CG Motorsport can supply you with an uprated clutch, but I understand the standard clutch is good for approx 200 bhp. The cheapest parts (genuine) I have found are from alfapartsonline; check his eBay listings.
In terms of specific tools, you will need a good set of Ribe bits ( you will need some large ones, ie 10, 11 mm, as well as the more common smaller sizes, Allen keys or/and sockets, the cam lock set ( the cambelt can be done without it, but unless you know what you are doing, get the lock set, it means no chance of cocking it up). Now would be a good time to change: the fanbelt(auxiliary belt), the two tensioners for that ( be careful when undoing the tensioner by the aircon pump: steel bolt into alloy; you can get releasing fluid to the back of it, and you could need a tap, M10 x 1.25)and possibly the pulleys (check the bottom crank pulley, if it is wobbly when running, change it), the water pump, and the cam sensor( if this fails, you have to do this all over again !). Be careful when removing the cam pulley; don't damage the thin part of the pulley with the cutout or your timing will play up, and be certain the pulley is properly seated before you tighten up or you could damage the locating tooth...and your timing goes! Check the How to guides at the top of the forum page, they explain all the correct procedures for adjusting and fitting the two belts. I believe it is false economy to refit worn parts, having gone to the trouble of removing them, but take notes and bag up parts as you go; always helps with the ' well, jobs done, but why do I have nuts/bolts left over! Scenario"!! It is not an easy job, but is perfectly possible, just take your time!
Get a battery with the highest cold cranking amps rating you can find ( varta do a good one, Lo96), eibach antiroll bars are excellent, but your problem may be you need new drop links, or possibly new bushes; if that is the problem, go for powerlflex poly bushes.
Hope that helps, and best of luck!