I went thru the replacement carb ordeal a couple years ago. My '67 Dart came with a 1920 but got so it wouldn't idle worth squat no matter what I did. Against everything I'd read here I tried the rebuilt route...one (only one they had) from Rock Auto and several Tomcos from O'Reilly. All were junk. Parts missing, incorrectly assembled, leaked, stripped fuel inlet, you name it. Ran like crap if at all. Poor store manager at O'Reilly's dreaded me coming thru the door.