Thats going to be opinienated answers, everyone seems to have their favorite... but you can get one from Recarbco, quadrajets were originals to these cars, but Edelbrocks and Holleys work well too... I`ll tell you what my friend said when I asked that same question 3 yrs ago "buy the one you or someone you know can work on"! I ended up w a 650 Holley and I`m happy w it...wasnt too much , I think it was around $275... I dont think it makes much difference which brand , but you`ll get all kinds of opinions! Mine is a 400 Pontiac engine also
so, if your familiar w one , buy it, if not find out which one "your friend who will be working on it" likes!
