Okay I'm not a purist. But I love the pure perfection of the exterior/interior design of my '67 Riviera. In fact, having been a car freak all my life and having owned some 60 vehicles in my 57 years, I have come to believe that the '66 and '67 Riviera are two of the most perfectly realized designs of the 60's, if not of all time. Therefore, I love driving my gold/black '67,and do so daily, except that now that fuel is pushing $4 a gallon, and I have a bit of a conscience about the raw exhaust I'm emitting, I'm considering an engine/transmission swap, but I don't know if I can acheive even a moderate improvement in fuel consumption and I'm guessing all of these crate engines have little or no emissions equipment. Perhaps an engine, transmission, and exhaust system from a modern car, preferably Buick, that has been totalled? Can someone enlighten me or at least point me in the right direction? I'm willing to sell a perfectly good 2003 Saab Convertible to finance turning my gorgeous Riviera into a reasonbly conscientious daily driver. Steve Carter