the bleeds are one of the last things to adjust , the factory is generally very close .
I have a Holley tuning guide in the Archives section , showing what to adjust & in what order .
you need to have the base idle timing around 14* , disconnect the vacuum advance & leave it off ,
Get the engine running & set all the idle mixture screws evenly , keep going leaner [clockwise] until the rpm drops off then turn them back to where it runs smooth
Now find out what the manifold vacuum at idle in gear [if auto] is , if it is around 6" you may need a different power valve