Here's an update for you all. Thanks for your help and input thus far.
Unfortunately the issue has not been solved yet. Like I think I mentioned before I checked the float levels and they were good - remember these are ZTherapy rebuilt carbs so I'd hope so
Since, I have installed a carter electric fuel pump, holley FPR, and a fuel pressure gauge. Removed the mechanical pump and put on a blockoff plate. Fuel pressure is a constant 4psi to the rail now. The only way I really have to test this issue is via butt dyno and test driving, as I can't afford $200 every change to go to a dyno and have them check the AFR's (though I am somewhat considering a wideband... seems so unnecessary though).
Today I ran a 3rd gear pull and it seems the same, no power gain above that 3500 mark or so and it won't even pull past 5500. What's next? I'll be calling the guy who helped me build my engine tomorrow to see if he's got any ideas.