Low MPG

Edel carbs are FAT out of the box so they "work" on alot of different motors, and "work" is subject to debate here. Get yourself a 65 FSM and look up the carb specs, or a rebuild kit for a 273 4bbl carb. It should show you rod dimensions and jet sizes but youll have to cross reference them to Carter numbers. Even a tuneup shop that has an analyzer should be able to get the carb in a little better shape than it is now, but jetting is a hardware issue. Does it smell rich, black smoke, choking drive-thru exhaust? try fatter rods to start, just a stage at a time. Edelbrock kits are not that expensive.