Getting a repeatable idle with a holley is tough. Mine will range from 1000-1200 hot. You need to make sure your rear throttle plates are contributing to your idle speed. You can start by taking both front and rear plates to square one and then turning the adjustment screws equally until you get to your target idle. The problem with only adjusting the fronts is you can easily get into the transition slots and it pulls fuel through them. When this happens, the idle doesn't want to go back down to the idle circuits only. Initial timing will also help your engine idle more consistently. Additional initial will pull more vaccum. That in turn means less throttle blad angle. What distibutor and initial timing are you running? I run 26 in mine with a total of 35. Custom bushings are available.
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Todd
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