1962 292 YBlock possible carb problem

I have this 1962 - 292 YBlock in the 1955 Fairlane I bought 5 years ago. The carb was new 4 years ago and is a two barrel and was running fine until about a few weeks ago. At least I thought it was a carb problem.
The car starts and Idles fine. after warm up when driven there is a stuttering feeling on acceleration. The car is a 3 speed standard with overdrive, but the overdrive is not working. Driving it as just standard shift. I am not real good with carbs but have made some miner adjustment to the mix. I thought at first it was running rich. so I leaned it out a bit. It didn't do much good. I tried again and still not good results. I brought it back just short of where it was and it runs but stutters on acceleration. If you go real easy on accelerating and shift it's smoother. I do have an electric fuel pump I put on this spring, but that has been running fine so far. The PSI on it is rated within the cars limits.
I have check points and cleaned, I have installed a better set of plugs. Don't see any arcing on wires. I did check accelerator pump how it's working by looking in throat and working pump and gas stream is strong and no air as far as I can tell. Kinda stumped right now and getting to where I need to put it in storge soon here in Minnesota. Any ideas!

By the way I forgot, I did as manual suggested and turned both settings all the way down to stop and brought them back a turn and a half as suggested. When I took it for test it ran just fine that day had good acceleration and pep. But when I took it out on a run on this Tuesday it was stuttering again.