What do you guys think?

They should fit with no problem. Anything that will fit an A-body will find even more room in an E-Body. Someone can correct me if I am wrong. I will be using the same headers in my Volare. As for the prices. You can get this stuff at these prices pretty frequently. The ceramic coated hooker headers can be bought new from Summit for his used price, but won't come welded directly to the pipes. The Cliffy Intake is a decent, but not great, price. You can get a brand new Offenhauser 4bbl intake from Summit for only a few bucks more, with free shipping. The cliffy will work with the headers in the sense that it is water heated and with the headers you will be eliminating the heat riser from the exhaust manifold. As for a carb, check out the 390 Holley for sale on these boards. A very good buy, but will need rebuilding I think.
Hope this helps. :)