I have used a RF with a 65+ range and arm, but a 42 glove, and he was fine. He was a back-up, but didn't make any errors in about 50 starts over two seasons.
Similarly, I've used a RF with a 75+ range and glove, but with a 61/56 arm, and he has done very well. Three errors in 145 starts, and seven + plays and no - plays.