Dano,
I'm running the 8007s on my tunnel-rammed 5.0 H.O. and the engine loves them. I idle at about 900. I rebuilt them to spec and they bolted right on; I just set the idles and took off. If you have the older Holleys, install the blowout protectors for the power valves; in a dual-quad configuration the PV's are a PITA to swap. (Are you the guy who built the side-by-side linkage? Someone on a board I frequent did this, and it made bowl removal a snap.) I've done my PV's 4 times, now -- my vacuum advance was sticking, and the backfires would blow the PV's right to hell.
FWIW, I get a hesitation when I romp it, but then the car goes ape$#!+ a moment later, as soon as the rpm's go up past about 4K -- which, from the feel of things, is about where the secondaries open. I have to kind of ease my foot down and then mash it the rest of the way to really get her to jump. But all 8 barrels is a beautiful thing -- like being shot out of a cannon.