Had similar problem,great on tickover and light throttle crap when i tried to give it some.Turned out to be float levels,went on you- tube put in how to set up holley? came up with box wrench video,very helpful:tup:
you need to set up your pump shot and vacuum secondaries opening. Lots of guides on the net and good books for the 4150 carb. Real Steel sell everything you'll need. Not just a case of telling you how it's done, you need to experiement to see what suits your engine and driving style and it's better explained in the Holey books.
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