Keep the Q-jet, they are very adaptable and can flow huge amounts of air if you make sure the secondaries can open all the way. You can adjust the secondary mixture by tweaking the spring tension on the air door (top butterfly) and the small primaries give you good gas milage and low speed performance. The secondaries meter fuel based on mass air flow so they are self- adjusting for altitude. You can get away with just richening the idle mixture screws for most situations. I used one with an Offy manifold on a Buick 225 on my jeep CJ-5. I couldn't kill it.
The other nice thing about the Q-Jet is the central float bowl, it will still operate nicely at really bad angles, it is the next best thing to fuel injection. No other carb can match it for steep grades.
