best size 2bbl carb or small 4 bbl for my 318?

dont put the 2bbl on it .youll regret it in the long run.tune the carb you have. rumble had some good suggestions.i had an afb on a 318 in a 73 valiant with 276 gears and a 904.it got 20 mpg at 65 on the highway,its actually the same carb refered to in the previous post.ive had a few 3/4 ton truchs ive tried to tune for max economy over the years.when i acheived the best mpg they were misrable to drive.id rather have a good balance of mpg and power and enjoy driving .jmo.