There may be some power to be gained from rejetting the 79 Q-jet. The 79 engines had EGR and the mixtures jetting tended to be leaner due to the exhaust gas diluting the incoming A/F mix. Otherwise, your carb should be more than adequate for your new engine,

I have tuned a few Q-jets and find them to be great street carbs. When well tuned, they can give mileage numbers approaching those of EFI. I probably wouldn't drag race one unless I was limited by the rules because they are difficult to rejet at the track.

They were made in 750 and 800 (850?) CFM ratings, although some were limited in the secondary linkage to open less for smaller engines.

BTW - You didn't ask, but I will add that a properly setup Q-jet will NOT bog when the throttle is opened. When the secondaries are set up right, the carb's air valve will just open as the engine can take the flow. The seat-of-the-pants feeling is just a continuous building of power.