Sure you can get higher output. "The thing is" first, "do you want' the old round back style for "restore correct" and if not get a 73/ish and later "squareback' which has improved low charging output. In that whole series though, I think it was the 45-47A output had better low output than some of the higher output units.
The other thing is there are LOTS of ways to fly depending on your budget and so on, how correct you want the car and so on.
Since there are few cars (only up through 69) that are grounded field, and since you are looking towards chrome (aftermarket) you may have to settlel for an isolated field, and ground one of them for the old style regulator
many guys disparage the old style regulator, but all replacements I've seen are actually solid state, so the oldl criticisms don't really apply
