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I've never had a problem with the Motorcraft/Autolites. They are very reliable and dependable. Also seem to be more fuel efficient than the Holleys, at least with my applications.
I just went from a 600cfm Holley with vacuum secondaries to the 600cfm Autolite 4100 and the thing runs like a dream!!! Idles smoothly at 550rpm.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.