You will need the VDF for whichever calibration file you want to start with.
I'm assuming that you want to keep the stock distributer and 4x reluctor, so I'd direct you towards the stock 2001-2002...

2 way controls are better known as Bi-Directional control. Since the engine, trans and Antilock Braking System(ABS) are controlled by the same controller, its called a VCM(Vehicle Control Module). ...

Tunercat Vehicle Definition Files(VDFs) are not VIN locked, so if you got a VDF for the 1996-97 Vortec trucks, for $79.95 you could literally tune every single 96-97 truck in existence. With EFILive...