The first thing to do is a vacuum test at idle to determine the power valve needed. 6.5 needs to idle with 13 or more vacuum. Divide the vacuum at idle by 2 and install that number power valve . My vacuum on my motor was 7 so I run a 3.5. If I had a 6.5 it would be rich.
If you have a larger cam then factory square the primaries and idle off the secondaries. That is if you have a 4 corner quick fuel carb.
One other thing is the air bleeds. the larger the bleeds the less fuel the smaller the more fuel. They work like a hole in a straw. Your carb sucks fuel from the bottom through a drilled tube. the air bleed is at the top and it sucks fiel out the side at the booster. if it sucks less air it sucks more fuel. These can be change buy just removing the air breather. If yours are not threaded in you can pull them and thread the carb. they sell an air bleed kit
Quick Fuel Air Bleed Assortment Kits BR-67245
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