I have a l59 5.3 in a my 04 tahoe. Looking to upgrade the motor some but I'm stuck on what my best option is. I would like to try and us as many LS parts as possible i want to swapp heads off another ls motor such as Ls6 or ls2 or just port and posh my stocks but I've read so many mixed answers I'm not sure what my best option is. I would like to swap to a TBSS intake manifold and a 90mm throttle body from a Ls7 or tbss. Not sure if the ls6 heads and TBSS intake will work together or not though but I have read about Ls6 heads and intake swap with nice gains. I will be running Texas speed long tubes and already have a CAI. Swap out the Pistons for flat tops. As for a cam I'm stuck between a Ls6 cam or a Texas speed 224r. What are your guys thoughts?