67 galaxie problems?

Ok,
I have a 2dr 67 galaxie 500 with a 390. I just had the original 2v carb and intake swapped for a 4b edlebrock and high pro intake manifold. He re-jetted the carb and tweaked it as good as he could. He said it was hard to get it perfect because it is so cold here right now. Anyways when i get on the gas hard i here a click and there is a delay like im not even on the gas then it reacts and takes off-my problem is that i am going to race it this spring/summer and that delay will kill me-so what might be the problem? Thanks!
-Ben

lots of possibilities

ambient temperature issues may make the engine run poorly until intake air is warmer, even if carb is jetted properly
the accelerator pump diaphragm has failed
partially plugged jet(s)
accelerator (pri or sec) pump delivered fuel volume is way too small
accelerator pump (pri or sec) delivered fuel volume is much too large
the timing of the accelerator pump stroke is way off
carbs' secondary linkage is hanging up
carb is severely overjetted for the temperature
vacuum leak affecting carb (intake manifold leak a likely source)
engine timing is not set correctly
engine timing affected by vacuum leak
bad gas