More than likely carburetor blockage. If your car has the original carb be aware that it is super fragile. They crack very easily. The potmetal used was about as bad as it gets. Heat riser sleeve is a possibility. As far as the settings, you can always count the turns, as you screw the settings in to bottom,then record. I can usually reuse my gaskets each time. If not they are easy to make. I check the flapper clearances and movement while I am in there. Occasionally a float will no longer float. I dont adjust the float unless necessary.