afb 4131s surge at wide open throttle

We I did some more digging into this 4131s carter afb and found out that the 120 - 352 tall jet has the same orifice as the .089 tall jet . carter used different numbers over the years with same orifice size. appears that someone had this carb running really fat . so I am leaning it out some with a 74 sec jet from 92 sec jets and leaner step rods. It may be that the issue it had is maybe it was running too rich. I'll see when I get it running again. it's just a little 273 commando engine .