Got an '82 CJ5 with the 258 and stock carb. Gas mileage is terrible (13 or less). I understand the carb on this is junk and am looking for ideas on a replacement. Holley, Weber, etc. A jeep mech. said that Rochester made one that would bolt right up and run's great, but he didn't know what kind. B. Gates ain't my uncle, so FI is out. Any hints?