Don, I too replaced the curved cabin-top traveler with the Garhauer 6:1. I believe I have pictures here on this site. 6:1 is wonderful; I think 4:1 would be too light in heavier weather.
I also recommend replacing your mainsheet block with a triple-cam with becket. Then, change the routing of your mainsheet so that at the last block on the boom it returns to the traveler and into the cockpit rather than going to the mast down and around to the starboard winch. I have pictures of this from 10 years ago or so when I did it at http://home.comcast.net/~sailrmann/ under hardware. About $90 for the block and shorten your current mainsheet. Bob Mann Windcatcher '85, #5928
