My idle speed with choke on and fully released at normal operating temp is ok, it's just that big rpm drop. I have the idle set at 600 rpm  in drive. But when you shift into nuetral or park it goes up to 1000 rpm. I have the mixture screws set at 4 turns out. I'll play with this a little and see if I can make any differance. I also do not have either the throttle solenoid or the solenoid for the vacume advance on this engine. They were not on it when I bought it. My timing is set at 10 degrees instead of the recommended 8 degrees. So many variables Maybe I'll drive it to Duncanville.

Well I got out my vacuume gauge last night and used it to set my idle mixture. It worked great. Runs a little smoother. With my idle speed in drive set at 600 rpm, my idle speed in park is now about 800 to 850 rpm. I also discovered my driver side headlight actuator relay has a very small vacuum leak. It doesn't do it all the time though. So I'll be pulling that off to play with it, probably have to replace. I temporarily block off the vacuum to the headlights and it runs much smoother. It just goes to show you it's always something. When my wife asks me when I'll be finished with it ....I just smile and say never.