[Sirrotica]

One other advantage to swapping the Q Jet is that the primary side of the carb is more efficient at fuel atomization than the 2 bbl is. The intake manifold is also more efficient as it has more height.

I've swapped plenty of 2 bbl Pontiacs for a 4bbl without a cam change, and they respond to the better intake tract.

Yes you'll get more out of the combination with all the attendant other parts, but Pontiac made thousands of cars with 4 bbl intakes, single exhaust and log manifolds over the years. The 3.42 axle is going to drastically alter your fuel mileage, but if you're fine with that reduction, that's fine.

It all depends what you want as an end result as to how you modify your car.