Aftermarket carb for stock air-cleaner?

all stock 340 air cleaners are 5 1/8" lower opening. all AVS and Thermoquad and Edelbrock and rochester and Holley 4 barrels since 1968 are for 5 1/8" air cleaners. the ld340 intake does not have a choke well, so any carb used on it needs an electric choke or a manual choke cable. use an Edelbrock with electric choke