[decooney]

Ken,
What is it doing wrong, and when does it do it?

At Idle?
Slow Driving?
Under load?
at wide Open Throttle?

From what I recall about your motor as compared to my build, they are not too far off. I run a Holley 830 HP, and it works great - once I got it dialed in. I've wondered how a Daemon 850 would run on my setup but never tried it. With your new muff setup, I don't think your carb is too big, but I could imagine it might need some rework if its stock out of the box.