Harbone

My 1979 Z28 has a ZZ4 crate motor with a 750 Holley. The car still retains its stock A/C but I need to know what to install for a idle up solenoid. I know some of the late 60, early 70's cars had vacuum operated "dashpots", just not sure what will work for my application. The car has a about a 500 lift cam and its a 4-speed. It idles around 900 rpm now but when I kick the A/C on it pulls it down to far at idle. Running at speed not an issue. Any ideas??