PROBLEM SOLVED! My problem was the A/C compressor would drag the engine idle speed down to stalling when the clutch clicked on. I installed a momentary switch that disconnects power to the compressor releasing the clutch when the throttle is released and drops to idle. It works very well. The switch is a push button that is NORMALLY ON. These are hard to find, as most momentary switches are NORMALLY OFF. I finally found one at Ace Hardware, their p/n 3023728 which doesn't seem to be carried in the stores anymore, but I located one on Ebay. I mounted this switch on an L-shaped bracket I made that mounts under the two throttle limit screws right beside the throttle bellcrank. The push button on the switch is depressed by the outer arm of the bellcrank (the arm that holds one end of the throttle return spring). I tried once before to post pictures, but without success. I'll try here again today. Anyhow, first the SPICA must be adjusted correctly, that is, the reference measurement must be .019" and the engine at 175-180F when you adjust the switch position. That's because the angle position of the bellcrank will change between hot and cold coolant. Any bracket you make, or switch that you use must be capable of some distance adjustment so it works properly when the engine is hot (after all, you will want the A/C in hot weather, yes?). I don't care if the switch doesn't work right when I first start the engine.
(OK, no luck in Drag and Drop. Either I'm doing it wrong or I have the wrong Vs. of Windows. I can email pictures to anyone interested.)