Holley/Demon Carb stumble

Found a complete 3310-2 carb on ebay for 50 dollars.(so i now have 2 front metering block off of a 3310) Only it look like it won't be here before the next race.
Will probably just try and tune it with the new throttle base.

I have a question on that.
Do i just drill much smaller holes in the new base plate Butterflies,(after i have installed it and then removed to see how much transfer slot i'm using) or can i tune it out with Idle air bleeds????? Good idea...Bad idea????


Start with butterflies that don't have holes. Then drill if you need them.

It's a big deal. It's such a big deal that carbs a are now being made with adjustable idle air bleed systems that do the same thing as holes in the butterflies, but it's more adjustable.