360 Magnum Budget Build Recommendations?

Crap can the intake and carburetor choices. That carburetor is an AFB design. Get a Thunder AVS 650, you will be MUCH happier. Also, since it's an LA, IMO you will be MUCH better off with this cam instead:

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=636&sb=2

Ground similar to the Thumpr cams, but not on as tight an LSA which will give a better vacuum signal and better street manners and still retain the choppy idle. IMO you will like the way it runs much better. And since you don't have a Magnum, the flat tappet will be much cheaper on a 16 year old's budget. It also calls for the famous 901-16 spring which is a single spring (read CHEAP) and requires zero machining on the heads to use. Even more money ahead. The cam's relatively low lift means there will be little stress on the valve train for a long time of reliable service. Just a smart move all the way around.

I agree about the RPM intake, OR even retaining the stock one. They are very good pieces. They are an excellent piece and outflow many aftermarket aluminum intakes on the market.

But crap can that carburetor choice. Besides being too big, get off the ricer kick. Who the hell wants a black carburetor? Stupidest lookin thing I ever saw. Much more important things to spend money on than something you think looks cool, that really doesn't. The Thunder AVS 650 will be all that engine will ever need.