Acting weird at end of track what do you think?

Hello,
I have a '65 Galaxie. The drive train consists of a bored and stroked 406, Holman Moody Ha-B camshaft, Hooker headers, a tri-power setup, and a C6. I launc the car around 2,500 with no problems and i am shifting at about 5500. When I shift into second the car is fine and runs strong, but when i shift the car into 3rd at 5500 it begins to lurch almost like a lean surge. When this happens it's like the car has hit a brick wall. I figured it has to be a fuel problem. Just for kicks and giggles I tried shifting it  at 4500 and it stopped lurching and I ran my best time of the night, a 14.2 @96mph, whereas before while shifting at 5500 i was running 15.5 if that shows you how bad it gets if I rev it to 5500. Something isn't right i should be able to shift the thing at 5000 or 5500. I will say that it was 90 degrees and very humid that night so that could contribute to the problem. I currently have a fuel pressure regulator running at 6.5psi. I'm pretty sure that this is enough fuel pressure, but I just wanted to get some other thoughts. Maybe it is getting starved for fuel at higher rpms?
Thank you,
Tyler  

is there any way to put a pressure test port in as close to the carb as possible ... hook a fuel pressure gauge to it and see what sort of pressure you are seeing at the top end...

you might also want to do a fuel flow test...  

how much fuel do you race with in your tank????   is it a stock tank????   stock pickup???

if it is.... ever thought about extending the stock pickup  with rubber fuel line... and another pickup strainer mounted on a short length of tubing...???

and with the amount of fuel flowing into that motor... perhaps a duel regulator set up...
one of the top fuel cars put a piece of clear hose in for one pass with a in car video camera borrowed from diamond p sports... and there was problems at the fuel pump inlet... so top fuel tanks got redesigned...  

I'm with the last poster it sounds like a fuel flow problem.  Pressure sounds OK but it might not be getting enough fuel  You might try one size larger fuel line.