Help w/340 carb selection

Well John....you have frightened me into sending mine out to be done. It is a 68 also, but for a 4/spd(glad I don't have kickdown to worry about), and I want it to work like new. SOoo....thanks for that$$$

LOL
(hopefully,you will get yours right, and I can pick your brain, to gain some of your new-found knowledge)