I'm going to get my engine rebuilt and I'm looking into some new upgrades ideas. Such as a new manifold and a 4 barrel carb. or fuel injections. Also, I want my 350 to have a new cam. so it rumbles like a beast.
I was looking at my Original Parts Group book and I'm so confused.      
anyone help me  

For a cam with some rumble but that's good on the street, I'd recommend one of Comp's Thumper Cams. But, you'll want to pick your intake manifold and carb first.

On the manifold, if you want ot stick with your Elky's Q-Jet, I'd recommend an aluminum manifold from Edelbrock. If you're gonna convert to a Holley, get the manifold from them.

I'd stick with a carb setup for your motor if that's what you've already got.  

What is your intended use racing,street or street strip.  

I'm going to mostly be using it street strip, but also a simi daily driver.  

I would use the weiand stealth intake manifold P#8016 a lunati street master cam & lifters P#07101LK witch has a .477 lift with 1.5 ratio rockers. I need to know the head casting # or the size of the valves in the heads before I can recomend what size carb. to use, maybe even use some after market heads.