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I bought a 600 vacuum secondary holley for my mustang a while back. Now that I just about have the car back together, I am going to rebuild the carb. Any suggestions on power valve and jet sizes? This is my car setup: .040" overbore, B303 cam, Edelbrock Performer intake,85 stock heads (for now), 3.55 gears and a T-5 tranny. I'll be adding a set of heads in the next couple of months. The power valve currently is a 6.5 and the jets are stamped 299.
 

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As far as the jetting, I"d go to the holley website and find out what the carb came in it 'as delivered', and use that as a baseline.
Power valve wise, depending on what size cam, and what the engine pulls for vacuum @ idle will determine that...........
 

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on the home page there is an entire articl on rebuilding your carb. Lots of info there
 
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