Tuning the idle circuit

[dougs69]

So far I'm thrilled with the results from all the things I have done. Its nearly perfect.

  Stock 1972 pontiac 350
Carb 17058201
Main jets = 76
Rods= .044
idle tubes= .036
Down channel restriction= .052
upper idle air bleed=.070
lower idle air bleed=.077
idle bypass air=.071
main air bleeds =.120
holes under mixture screws=.081
 
All parts bought from Cliff,   

problem is a rough idle.  mixture screws out 5 turns.    apt up 5 turns.
The car performs well, no complaints
Im thinking it needs a bit more fuel at idle.    should I shrink lower idle air bleed to .070, or open up dcr to .055, or do something with the holes under mixture screws? or a combination?  I dont want to make the wrong move, its so close!
you have all been such a huge help for me, i want to wait for your advise and expert opinions. Thanks Doug

[Cliff Ruggles]

Smaller lower idle airbleed will help.  Take it down to .070", and then open up the down channel restrictions if needed....Cliff

[dougs69]

That did the trick! shrunk lower idle air bleed to .070 and opened up dcr to .055. 
The car idles well, mixture screws out 3 turns, apt up 5 turns and running better than it has in 26 years. Thank you all so much for your help.

[Cliff Ruggles]

Good news!  The idle airbleeds, as you found out, have a major impact on fuel delivery to the engine with any given settings.....Cliff