The stock carb is awful and overly complicated on these trucks. They're wheezy and stumble on themselves on WOT. But try the inexpensive tune up stuff first before upgrading the carb and see if that helps. Try cleaning it and all of the passageways with carb cleaner and a single thread of copper wire from a threaded wire. Make sure the rubber and plastic parts aren't cracked or leaking. Clean the PCV system, EGR and air filter, too. Replace the spark plugs and wires if you can't remember the last time you changed them, too.
Or if you want to replace it, you want this Weber:
http://www.webercarbsdirect.com/product_p/wk614.htm
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