Hughes converters

Anyone have anything to say about Hughes converters? Looking at one for my dad's 340 Duster. I have a Fairbanks 3000 in mine, but they no longer exist. He needs a little more stall than what he presently has with a generic stock low stall replacement of about 1200. Was looking at either a 2500 or 3000. Don't want to much because he is picky about change. Running a stock cammed 340 that is .060 over with 3.55 gears and 27" tire. Might in the future go to a 3.23 gear.