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To set a carb you seat the mixture screw, then unscrew 1.5 turns and adjust from there. Of course for cars you got jet size too and accelerator pumps. Depending on the previous owner you may have some vacuum leaks and those lean out your mixture.
Id use a vacuum gauge to adjust for highest vacuum and maybe use a squirt bottle to check for vacuum leaks. Lean is mean and I think once unleaded fuel was invented or used they had to richen up the mixture to make up for the difference. If its the original engine you may need to use a leaded addative.
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