Hesitation at WOT in 1st!?!

[Blaster]

I've ran into a wall with my car(91GT). It has an E-303 cam, performer RPM intake, and Performer Heads, along with exhaust, pulleys, etc. The problem is that when I punch it around 2000-2500rpm in 1st gear it hesitates for about 1/4 second then takes off. My TPS is fine as well as fuel filter etc. I'm guessing it's a fuel problem but I'm not sure. Do I need 24lb injectors?? I was also told getting a chip burned would help quite alot. I'm also thinking maybe an adj. regulator might help. Anyone ever run into this problem???? It runs great otherwise, but it hesitates for a split second (like a carbed car) when I hit it around 2500 in 1st. HELP.