I had the same delima on my 67 YS 400 auto
with a/c. I had run a 1975 Q-jet for years on it not knowing that the vacuum was manifold and not port, basically 180 degrees out of phase for the car!! Also, the mid 70's Q-jets have different shaped base plates and do NOT cover the intake properly.
So.. I ended up going with an Edelbrock #1910 electric choke Q-jet for 1966-73 Pontiacs, with the Edelbrock Performer intake #2156 to accomodate the electric choke. Dont let the 850cm rating of the carb scare you, it runs like a dream out of the box. Bolt on performance and drivablitly has been WONDERFUL!! I could not be happier for my daily driver, and you dont have to worry about rebuilding a carb that is likely older than you or someone you love! Would HIGHLY recommend it.
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