Just my .02: I don't think the secondaries would be much of a problem since Q jets are more or less self regulating on the amount of secondary airflow, "on demand". Q jets were factory carbs on some of the weakest 305's GM made. Might be a little tricky to get the secondaries to be in synch with each other. The biggest problem I can see is rigging up a linkage to open the primaries of the back carb first and delaying the primaries of the front carb to start opening til the rear primaries are about 1/2 way or so open. Of course there would be the mods to fit the manifold and fabbing the fuel lines, air cleaner, etc. Then there's the inherent shortcoming of a tunnel ram on a mild street engine.