Hi there hannahfaye, with you being a 34b already and having an uplift and 340cc, so most definately will achieve a size dd or most probably an e cup.
They will look perfect on you, after the op though, dont be put off how flattish they look and wide apart, they will only be like this for a month or so. I can assure you a 340cc wil give you a nice size. if you really want ask the surgeon to take in 380cc, i asked for 380 but they cudnt fit them in, as im quite slim around my chest area, and with the uplift there wasnt much skin left to hold a bigger implant. but you can always ring mya and ask them to take ini a 380 and try it. Which ever they put in, you wil def get a dd to an e cup.
Ive put about 9lbs on as im on that stupid depo contreception, and its made my boobs go up a cup size to a 32f, there not massive though just right.
my friend is the same size height as you and she had 340cc and they are the same size as my boobs and look lovely. You will be very happy with them. The cars on an uplift fade very well, mine are nearly gone, they only show up a bit after a hot shower XX