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I've found as a first step is to find out whats in the carb as to jets and power valves and then check to see what Holley put in it when they made it
As a general note on most street engines the proper drivable jets will fall in a range of numericlly being about egual to the carb cfm
ie 650 carb---aprox #65 jets, 700-750 carb---70-72 jets, 800 carb 78-80 jets
Make sure your power valve isn't blown and is rated a couple numbers below your engines vacume
The carbs haven't changed since you worked on them, still don't look down the carb while the engine is cranking!!!!
Jerry
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