fundgh,
I can measure how much I moved my forks up in the clamps if you want with the 120's. If you have a different length, put the old ones back on, place a level on the seat, if you have an adjustable one that is better, or block a regular until it is level. Tape it down. Next, put the longer links on, and then drop the forks until the level shows "level" again. Weight distribution is back to stock... Of course all this is without a rider on the bike. After you get the bike level, go ahead and check the sag with the rider on the bike. The shock will now be tad softer and you may have to dial in more preload to make everything good again.
If the forks are too short the front end will tend to dive and perhaps dig in too much in the corners. If the forks are too long, the bike may have a tendancy to push in the corners or perhaps a wheelie a little more than before.
Regarding the handlebars, they are suggesting placing a "riser" on the triple clamp. Check your bike shop or rockymtn. They are usually 1". This will get the bars up some more and allow the legs to rise up into the triple clamps more. The 120's is about as much as you can go and not have to do this. However, my case may be a bit different than some since I have 30" wide (YZ85) bars on ours. With regular width bars, the forks may not actually drop as much as mine do.