carb issues??

hey ppl, i have a holley street avenger 670 on my 360 and it doesnt do it too often when im going around town but mainly coming off the freeway from turning 2500rpm to a red light (oil pressure is at 30lbs, temp is at 185 nothing out of the ordinary) if i start to give it gas after i just came off the freeway the car damn near shuts off unless i floor it or let off and gas it quickly. Same thing happens if im just cruising and i stand on the gas it bogs for a second and goes. i have to result to manually shifting it just to get it going so that it doesnt turn off. Any ideas??? i think its my carb that needs adjusting but it doesnt seem like i can just get this thing right no matter what i do i.e. too lean, too rich. im thinking buy a new carb i was looking at the edelbrock thunder avs or a double pumper whats everyone else running?

p.s. already checked the timing

thanks