Vortec injection is the sucky-looking one with the spider tubes underneath the manifold.....history of leaking (eventually). With
that injection, you are pretty much stuck with the factory horsepower and torque.....you might gain a tad with the headers but the rest of the system is pretty much unchangeable (a cam might help or it might screw things up). There are a few folks who tweak these computers. I am a real fuel injection fan but for a hot rod, I would recommend going to a 2116 Edelbrock manifold with a holley carb.....and you have to buy a distributor since the vortec engine didnt have a "real" distributor....the thing that looks like a distributor is a rotor for the plug wires and a pickup. This way, you can trash the computer OR add a better injection system if you dont like carbs.