'63 Dart problem

I went thru 4 rebuilt Holley 1920 in my 1969 Dart before I found one which made it idle like a kitten. Apparently, all the others had a clogged metering block, which is sealed and hence not normally rebuilt. The others would idle rough (running lean) and sometimes stall when leaving a stop light, so had to goose the throttle.

When I had a collapsing suction hose in that car, it idled fine but would start stuttering at higher fuel flow >55 mph.