A properly built Q-jet is supposed to be killer, but that might put you out of your budget. Is this for street, strip, running over old ladies? If you use the vortec's and they haven't been modified, there's only a certain amount of lift they can support. It should be fairly simple to find an intake to match the where the camshaft makes power. In fact, you may want to call the cam companies (can't remember if Erik or it was techinspector that used to recommend this action) and see what they say given your inputs and where you want to be (in terms of heads, engine, exhaust, transmission, etc). Hopefully the specs they give match up pretty well.