While 4 bar suspension is nice to look at, there is a chance for potential bind (says I who has a 4 bar rear suspension) take a look at 4 link setups as an alternate.
http://store.gaugemagazine.com/index...ROD&ProdID=176

http://www.afcoracing.com/tech_pages/4link.shtml

Both are good reading - wish I had before buying my chassis