The GM Performance p/n 12496821 that I liked to above has EGR supplied by the factory Vortec exhaust manifolds. Also has hot water provision to heat the TBI. EGR and coolant passages shown below. And no, it ain't cheap.
Use a 1996 exhaust manifold p/n 12557828, EGR supply tube p/n 10220275, and EGR valve p/n 17052693 if yours are missing from the Vortec engine you have.