The stock Pontiac cast iron intake flows VERY well. For the motor you are building even with the RAIV cam (which I think is too much cam for that combo) the factory cast intake will be fine. I wouldn't even consider an aluminum intake unless you are planning on some serious track time.

Not only are there fitment issues but you will have to do some minor mods to get the throttle cable to work.

As for the carb, I'd send a correct Q-jet off to Cliff Ruggles to have him work it over for you or at the least buy one of his rebuild kits and do it yourself.