Throttle and Bog Down Issue

[Hewfil1]

Hey again everyone, got another issue, so here it goes again. My truck's been running funky since day one, and it's time I fix this issue for good. Idle is fine, at speed is fine, but acceleration from a dead stop, she chokes and sputters, before finally responding. I HAVE cleaned the carburetor along with my fuel lines, tank, new filters, everything. Timing has been set, plug wires checked, new plugs installed, carb tuned, yet there's still and issue.

My truck is a 1974 Chevy K10, listed GMC conversion under the title. My engine is a 5.7L 350ci SBC. On it, it has a Weiand dual plane and Carter AFB 725CFM carburetor. Inside I have a set of Keith Black Hypereutectic pistons. Exhaust is Hedman headers with a three inch exhaust system(Don't quote me on this, they may be 3.5). The exact cam lift I do not know, nor the heads.

Any advice on how to fix this would be greatly appreciated.
(Side Note: I have been told that a 725CFM is to large for my size motor and that throttle response will suffer. Is this also true?)