Well, the Holley wasn't setup, it was just installed. I have no idea what it came off of, but I threw a kit in it and it runs.
Here is the history of the Holley: I bought the engine from the college where I work after it had been "rebuilt" by the shop teacher who then retired. I think freshened up is a better description of what he did to the engine, new bearings, rings and ground the valves. He removed the Ford spread bore and used a Q-Jet adapter to make the Holley fit. The new instructor sold the 77 dent to me because it would not pass California smog tests with the Holley carburetor. So, I of course put the engine and tranny in my bump and added a Edelbrock Performer manifold to make the Holley bolt on correctly. I know nothing about setting up a Holley, so it was just bolt it down and go. I subsequently put a kit in the carb and it seems to run okay other than cranking a few times when hot before it starts. At this point I would have to say it is the first vehicle I have ever owned that I could actually see the gas gauge dropping while cruising down a freeway. If I could get back to around 12-13 mpg I would feel a lot better about the conversion from a 360 to a 460.
I do feel really, really, good about the increase in power. Did I mention that it can accelerate like mad going up hill in the passing lane? This has to be a surprise to a few folks when a white haired baby boomer in an old truck rockets by them.
Anyway, back to the carb question, I am opening to suggestions on get better mileage that relate to the carb.