As you make adjustment to the mixture screws, give it a few seconds to find the new setting, then adjust the idle speed screw (throttle plate) to the recommended idle speed, usually around 700-800 RPM in gear. Repeat until motor is happy with vacuum and idle.

great tip...but what shuld be my starting point..i know they cant be fully closed..screw in just enough so the engine can run or somthing difrent

and what should be my happy vacum..how much hg or -psi

Holley Carb Adjustment

I read that allready...the thing that happens to me is wen i find the highest vacum in idle and i put it in gear so that the propeler turns it creates big load and my engine shuts down..im thinking my idle mixture is too lean so ill have to set a more richer mixture next time...never the less yo all are my think thank and i thank you for your patience learning me how to properly toon USA engines.

Might be a problem with ignition system.

That is true....once had a problem where the engine idles great in neutral but always died when i put it into gear. Spent countless hours swapping parts. Turned out it was an advance spring inside the distributor that broke!

I've put it 8 degrees advance but i didn't chek the distributer...ill do that but it's allmost 9 oclock in the evening so it is night and i can't test it now.ill do it tomorow.

Is it an alpha or bravo drive? Alpha uses a shift interrupter that interrupts the ignition.

That has nothing to do with idle.