RV-3s have no adjustments (unlike other models) and are set up for a person of a certain size. You would certainly not fit comfortably in ours. But, with a little work on the pedals and new seat cushions, it could be set up for a taller person. So, you would either have to luck into a -3 set up for someone about your size or be ready for working on the pedals and buying a new seat.
Personally, I wouldn't want to go from an -A model to the -3 without significant tailwheel (preferably RV) time. You can't get any transition training in a -3.