No reason to check clearances any more often than usual. Check the clearances after you fit the new cams, my experience (and a lot of others' too) is that the same shims did the trick.
There is a thread on
www.svrider.com forums with lots of info on this. There are alos pics of the cams with timing marks, but to double-check I also worked out the marks myself by looking at the lobes.
If the carbs were right before the cam swap then they should be fine afterwards, but get a dyno run anyway, as you want to see the extra power, and confirm that there aren't any carb issues hanging around. You'll see a big difference if you're fitting the ignition advancer at the same time, it'll be a totally different bike. Both mods make it louder too.