Ok just finished putting in 243 heads with 3 angle valve job, custom grind cam to match, catherdral port stock 5.3 intake, k&n intake kit, perfoma built trans with 3k stall, dynatech headers with high flow cats and billyboat exhaust. Just wondering about upgrading, intake manifold, fuel injectors, fuel rail and throttle body any ideas. Thanks

 

Depending on the year of the factory injectors, I can tell you that you'll need to upgrade those. I have a similar setup and I'm all ready maxing the stock injectors. The intake depends on what your final goal for the truck is.

 

I am assuming you have the old style truck intake with 3 bolt tb
if so then going to a nnbs intake with stock 87mm tb is a good upgrade.