Hey matt, The 350 rocket isnt that much of a gas guzzler. with the 73 it was a smog motor, so its not built for performance. You can build it up if you want, but in its current state its not inhumanly bad. I got about 17 city 22 highway with my Cutlasss running a 403, and my 260 only got slightly better mileage. You might want to give it another look.