Pull a plug and check the color, rich will be black, white with purple dots lean, grayish brown just right. Back the accelerator pump off some, if its way worse, give it more fuel via the accelerator pump. You might be able to adjust the accelerator cam around to a differnet hole or you may have to by the next one up for a quicker shot or longer shot of fuel.
A slightly rich idle screw adjustment can help off idle a bit, won't help mid range.
And for the record, owning Holley means, many, many tries at getting it right!
Joe
