I know a few who've fitted the dynacoils and not found a noticible difference really.
The FCRs however do make a very noticible difference and are about the best mod you can make to the carb engine without spending a lot of cash. Get the 41s rather than the 39s, I got mine from Chris Kelly at California Cycleworks in the states, $780 ish plus $60 postage, arrived in 2 days, good service. A K&N air filter is included too. Not sure there's any more power at the top end, but a definate improvement in the midrange response.
http://www.ca-cycleworks.com/ [Edited on 17-2-2006 by Zimbo16]