I am guessing you are talking about a Muti-port fuel injection kit, since your truck already has fuel injection, it just has throtle body injection. I had the Edelbrock Multi-Point fuel injection on my last truck. It really didnt make that much of a difference in power, and the gas milage seemed to get worse. It was a big job and it required a new fuel pump too. As for a chip, if you plan on getting the multi-point, it has its own chip, and you cant use any other after market chip with the kit.
Also... After installing the Edelbrock muti-point kit, my truck surged really bad when rolling off the throttle. Edelbrock said this is "normal".
Let me know if you have any other questions.