Being yours is a 96 a good site might be www.ckresto.com depending on what your looking for right now I am fixing a bunch of little nit-picky things wrong with my truck (dash lights out, switches broke, handles and latches broke). that or maybe www.lmctruck.com would be a good source.
I recommend LMCtruck, they have a lot of info in their catalogs alone about the stock configuration of your vehicle. I've also had somewhat good luck buying dress up parts at regular old autoparts stores like pepboys, autozone, etc... but do not buy engine dress up parts from down the street autoparts stores, alot of those parts are made to a low quality control standard (possibly because most of them are made in china) and could give you real problems down the line. The main upgrades that I recommend are brake, steering, and possible engine/transmission upgrades. You usually get good results from upgrading these systems that make day to day driving alot easier in a vehicle such as this.
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