I just purchased a remanufactured Q Jet from INCO Automotive Industries for my 1980. It has all new working parts ( throttle bushing, vacuum dashpot ect) and was surfaced reground on all mating surfaces. It was calibrated and shipped in two days. Cost was $183.85 plus $50 core chge. It also was number matching. They will rebuild your old one if you want.
INCO Automotive Industries
1456 62nd St. Brooklyn NY 11219
331 1620
www.inco.pair.com
Good Luck , Fred