Well as usual for me I have another issue that most don't run up against. My BB will stall at idle after driving a few miles.(not all the time and idle RPM makes no difference) Cleaned out no visible dirt in the carb..all adjustments are good but found that when spraying the throttle shaft with cleaner, the idle will drop (actually sounds better) then goes back to set speed. Also the shaft was loose. Issue is the carb is VERY old and I see Holley stamped on the front but there are no numbers anywhere on it like "4510"..or date stamps. Can anyone, by looking, identify the series it is so I can order a new throttle shaft. Thanks in advance to all. Thanks MOPARTS