Hi Steve,
Call "Red" at McLeod......tell him what you have and let the experts give you a recommendation. Typically when you say 11" versus any other dimension you are going by the seat of your pants. Talk to people that can give you a recommendation for Clutch, pressure plate, bell housing, throw out bearing , internal/external actuator etc. a complete system.
http://www.mcleodind.com/
Good Luck,
Tony R.