[blykins]

There's really not a good "cheap" aluminum head. There are Procomps, but by the time you fixed all the things wrong with them, you could buy a nice set of heads.

A 210cc Vic Jr. head on a 306ci engine would make it pretty doggy on the street, but if you're on the track a lot with a steeper rearend gear, it would probably be ok. A nice set of AFR heads for the 347 would really make some power.

As Rick mentioned, you're better off with a Vic Jr. or Super Victor intake for the 306.

As for the carb, it will be hard to say how close an off-the-shelf piece will be out of the box.

If you're willing to pay a little more for some custom work, I can provide a Quick Fuel carburetor that has been custom assembled to fit your engine/application. It will be built from the ground up and should be extremely close to the tune that you will need. My gut tells me a 650 would be the right size.

If this is going to be on the race track a lot, there are better choices for a camshaft as well.