[rbohm]

depending on the cam and heads you plan on using, i would bolt the holley on out of the box and see what it does and tune from there. holley's were designed to be used with modified engine's, that is why they run rich on stock or nearly stock engines. after you add a cam good heads and headers you need more fuel to get the right mixture for the engine to run right. which is why holley's are jetted about 5% rich from the factory.