[Frank Messina]

They're not hard to tune you just need to do things in order. Get a Holley tuning booklet and become familiar with the process. Check the online Holley catalog to determine what size jets and power valve came on your carb and make sure you have an assortment of jets on hand to cover what you intend to do. The idle circuit supplies gas all the time so that's where you start. Familiarize yourself with how to properly set the idle mixture. It's often too rich out of the box. Once properly set that may fix your condition and you can stop right there. If it's still rich after that, then look at the main jets, but make changes in small steps. No more than two jet sizes at a time. If two is too much back up one, if not enough go two more. Only work on one thing at a time so that you "don't lose the rabbit". Idle, then primary, then secondary, etc.

Frank