Well....I have not had good luck with Holley carburetors but I don't have a choice if I want to have a six pack...unless I go fuel injection and that is a little too expensive for me at this time.
The six pack that I had on my 440 ran real well (stock set up-rebuilt) but I had it flood over a few times on occasion. They seamed to not stay in tune and I thought they were rich...