First, whats wrong with the 3 lever luk style?
- the /6 clutch was the thing to go for when racing a 4 sp behind a v8 for quick shifts..
You should be able to use a v8 clutch since it works the other way around.
It should hold up just as well as diafragm one.
( if i remember correctly you are righ about v8 clutches, its just the smaller clutch disc they use in the v8 assembly.)
Comfortable, nah itll never get as soft as a modern one in a modern car.
There is difragm clutches avail but they are quite expensive.
- what broke on the clutch?