Don't want to annoy you (on the contrary, I'm trying to provide help), but diagnosis via keyboard depends on info and feedback you're providing to questions that must be asked, issues that must be eliminated, point by point.
You have provided zero feedback to my specific carburetor questions.
As you've assured us valve timing and clearance are addressed, I'd then urge you point your efforts towards carb internal checks, corrections and setup.
Before throwing in the towel and turning to a shop (big $$$) you might consider the refurbed carbs i linked.
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