I'm thinking about grabbing the holly HLY-300-66 Intake for my k5. I heard that Holly is the way to go because you can use aftermarket TBI's as well as the stock one. On summits website it says that the HLY-300-66 is only compatable with holly tbi units. Is the stock unit a holley?? Can I use my stock TBI with that till I get 600 bones for the holley?? I'm sorry for the stupid questions but I'm very confused right now!