Some new ideas for my Slant

I guess the main thing I'm after is that throttle response. This cars going to all the tourism places around where I live. I like a bit better mileage: so best intake for that is a 2 barrel so I read. I also have a duster hitch and a little trailer for camping. I like the long rod because its more efficient at highway speeds. Anyways. I am looking for a bit hotter of a cam, and the hooker headers look good online. I'm thinking I might be able to mug weld myself some... But that's a project for summer. Thanks for the input so far guys! I'll reiterate: mileage, efficientcy, and better exhaust. Your suggestions ill keep in mind. Does anyone know what price would go on a hotter cam? Reground or new or used? Thanks guys!