Red Headed Stepchild-75 Swinger LSX Swap

I'm sorry I can't remember the intake ports on your 5.3 right now, but keep shopping Ebay for LS intakes for the ports you have. At this point it will be way less expensive than the FAST or Holley intakes and the performance difference for your power level will not be noticeable at all. I like how the 5.3 spins up. You'll have fun with it.
The intake ports will be the cathedral type ports on mine. I've seen too much bad stuff about the sheetmetal ebay manifolds and having them flex like soda cans. Which is funny because the holley sniper/FI tech's are identical to the ebay manifolds, but haven't heard bad things about them. This link right here is why I will not buy an ebay sheet metal manifold.
Symbol Performance SCAM

Although I do plan on picking up a set of the holley rebuilt 75lb injectors for $175. That should be more than enough injector for me and this stock motor. All the research I've done and experience I've gained with other people, the 5.3's are the better options for stock block boosted motors.