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I have an 83' El Camino w/ a 305, w/ a rochester quad carb. After screwing the air fuel mixture screws all the way in, how many turns out do you do to get an optimal setting? ThanX
 

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After I rebuild a CCC carb I preset the idle mixture screws at three turns off of their seat. After the engine is up to temperature and the ECM is in closed loop I use a scanner to monitor the dwell and do the final adjustment of both idle mixture screws (in equal increments) to get the dwell as close to 30* as possible. A vacuum leak or a bad oxygen sensor will make it impossible to set the dwell to 30*.

Here is a good article on how to do it:

http://tlentz.oldsgmail.com/howto.html#Mixture

:mrgreen:
 
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