[truckin 79]

I would go with the Holley if it were mine. The holley is easier to adjust float level and idle mixture screws on the side. The q-jet has idle screws in the front and if you get junk in carb you have to take half the carb apart to clear. I have a q-jet on Trans Am and Truck, it took me a lot of tinkering to get the q-jet on TA to start with just a flick of the key. The q-jet on truck is fighting me though and needs some more fine tuning, I just rebuilt q-jet so trying to stick with it for now. I might switch to a Holley on truck with vacuum secondaries and it should get about the same gas mileage as q-jet. In the end both carbs are good but q-jets a bit more fickle IMO.