I have a holley 1460 that i bought a rebuild kit for. After putting it back together and bolting it on the engine (327), I cant get it to idle under 2000rpm. I have tried switching power valves and cant come up with any results. I know a vacuum leak could cause this but the engine itself does not have any vacuum leaks as it runs perfect with other carbs, so the problem is in the carb itself. Where are some common vacuum leaks on the carb I should check for?