yea, kelly moss did make a 928 engined 944. They used a 944 gtr(1 of only 7!!) and cut the front end off for orginality,and replaced it with one specially fabricated to fit its 6.6 liter engine with 711 hp & 680 lb of torque!!! pics at
www.kellymoss.com
http://www.928trackcars.com/hanson/images/km/km.htm