If it didn't do it before the carb swap it has to be a carb issue. If that is the case, what you are describing sounds like a "lean stumble".
You can usually fix a lean stumble by changing to a larger accelerator pump cam. If you change the pump cam and it helps some but still pops a little you might also have to increase the squirter size.
the pump cam is the colored plastic piece that goes on the primary throttle shaft, right behind the lever where the throttle linkage connects. The cams come in different colors which correspond to different capacities and are held in place by a single screw.
The pump squirter is inside the carb under the choke plate between the two front venturi. They unscrew with a philips head screwdriver and are numbered. the larger the number the larger the hole and the faster gas passes through it when you hit the accelerator.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle