This thread has all the info from mine.
http://www.rib.net/forum/f45/willard...ect-58754.html
Integral fuel tank is pretty darn cool. I also quoted an ATL bladders as an option that would be simpler but not as clean.
Twin prop 560 is big improvement, also a tad shorter and more efficient.
QSB 330 engine, much nicer than 6BT
BAM tranny. Beefed up Borg Warner 72C.