85 GT best replacement carb to help - Catalatic converter, glowing
 

Now that I know what is the problem with my glowing cats. Everyone say replace the carb. I need options. Or I am getting confused looking online. To many choices and some say 500cfm, 6, 650, etc...I am not sure if these are direct swaps.

Best replacement that will get reliability and gas savings.. engine is too old for HP upgrades. I need a direct swap replacement with minimal fabrication or setup. THanks

old numbers E5ZE GA A4K24 was on the tag. On the top was E5ZE 9510-GA list 50265 2684.

85 GT 302 5sp, current 4bbl, no upgrades. STOCK mostly