340 Full throttle hesitation

Hi guys,

I did a search and didnt find what I was looking for.
This is a noob question im sure.
I have a 340 dart swinger. I dont know much about the engine other than its been bored 30 over, it has an edelbrock manifold, Aftermarket carb (carver I think?), and a flat tapped cam.
My question is if I give it throttle slowly its fine to redline. But if Im at.... lets say...2500 rpm and put it to the floor is almost dies or hesitates but just for a second then its fine and takes off.
Any help is appreciated. Thanks