71 dart hesitation at steady cruise

Belvedere66 said
OK, makes sense so far. How would I go about checking for this and/or how do I fix this "lean surge"?

EDIT: I found some information pertaining to the power valves located in the carb that if too low a value or busted may cause a mid throttle surging. I remember reading that you take your highest possible vacuum reading after adjusting your idle mixture and then divide in half to get your PV value.....if so then it would be a 9?? Seems high to me but I am far from an expert!

I'm not a Holley expert, but I seem to remember the same thing.
Got to get that mid throttle fuel richer.
(if we are on the right track anyway) :D
Am A/F meter is a really nice thing to have for stuff like that, as it would tell you exactly what is going on with the fuel mix at all ranges of throttle.

A manual choke would tell you also, if you slightly apply it during that surge it would straighten out if that was the problem.