Thanks again guys so that kills my theory of building a 20-21 mpg highway C-Body. So looks like I'm back to looking at 68-70 B-Body 2 door cars with small block/auto setup and 2.76 gears. Boy finding one that's not a clone/bondoed/overpriced is going to be tough unless one deal comes through for me. An A-Body will be too small for me. Thanks to both of you though for your responses.