1. Too much compression for iron heads and pump gas. Either use better gas, lower compression, or get aluminum heads. Take your pick, none of them is an inexpensive solution.

2. Are these the 4782/4783 mechanical carbs with accelerator pumps on all 3 and fuel inlets on the driver side or are they stock carbs with mechanical linkage added ditching the vacuum pods?

3. No one has asked so I will. What jets are in the carbs? All of them. What pump nozzles? What power valve in center carb? Has anything else been altered, such as, Idle air bleeds, idle feed restrictions, main air bleeds, power valve channel restrictions?

In theory, there is no difference between theory and practice. In practice, there is.