Well, spent the afternoon in sheer frustration.
Changed the idle air bleeds from 73 to the 78's that were in my Holley. Went from 33 squirters to 31.
Got it idling real nice, pulling 12 inches vacuum at 1200 RPM........just like always.
Off idle stumble better but still there and I just can't get rid of it. My last resort tomorrow is jetting. I think it's rich. Turns out I was running 74'S in my Holley, this has 78's.
Can rich mains cause an off idle stumble?
