adding $1000 EFI wont improve gas mileage either, unless your way out of tune on a carb. 14.7 stoich is stoich: from a carb or an injector. Headers usually lean out a manifold tuned carb. Dyno results on a tuned carb over EFI are not night and day, but cold start driveability is. Carters are usually pretty flat across the curve AFR wise. Take your car to a tuneup place with an exhaust gas analyzer and have them tune the carb. Or buy a $150 wideband and a strip kit and do it yourself and still have the ultimate carb tuning tool in your toolbox. If you want better fuel economy, increase your compression ratio, cam down in duration and go to a shorter rear end.
