Just a quick reply to this. I have a 500hp 383 in my 69 and I went from a Quick Fuel Q-750 to the new Holley Ultra HP 750 and its a world of differance. Better responding carb by far out of the box and after changing jets for my engine and tuning it in I'm going to change out the carb on my 67 to an Ultra HP also.
Holley did an excelent job with this carb and to go from sea level to 9000 feet with no issues for 4 days bouncing around Reno and Tahoe, says a lot for the carb.
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