I was looking at the cost of the r154 and a new bellhousing plus any misc stuff (there's always misc extra costs) and comparing that to rebuilding the w58 with some stronger running gear.
Taking into consideration the w58 is already in the car I think it'd be easier to keep it, either rebuilding one stronger or just swappin new ones in as they break.
or maybe just not abusing it as much, but thats not much fun
I got most of my conversion gear from CRS, bought the box and some other misc parts locally. The CRS gear really went together quite well. The guy who helped me pretty well refuses to do these conversions with anything other than CRS gear.