or hitup a boneyard and find a 1985 or newer hydraulic clutch setup. I had the mechanical and it sucked.. stiff spring so it was hard on the leg to shift.... hydro clutch all you need is the pedal assembly from in the cab, resivour outside, brake master cylinder, bellhousing and stuff... like cluch fork, clutch pressure plate, throwout bearing, etc....
all in all since you are going to have the tranny and motor out.. id just go this route.. you will never regret it....