Can't help you on the type of clutch, just offer some possibilities.
On the slipping: one reason could be that as the clutch disk wears the PP fingers tend to move closer to the TO bearing. If you are limited on your clearance between the TO and the fingers you might not be allowing the clutch to engage all the way.
As a test pull your clutch arm that the slave pushes on back toward the slave and see if you have movement there. Its a little hard to tell since you might feel the fork tap against the TO instead. Judgement call on that.
Depending on the type of TO you have it may move anyway if the TO has the spring retainers on it instead of the groove type.
So move it away and back and see if you can feel the TO tap against the PP. If there does not seem to be any play that could be your problem.
As far as FW if it's not in to bad of shape you can have it refaced for less than a new one usually if needed. Just have to find a clutch/brake shop that does them.
[This message has been edited by Dodgerunner (edited 12-02-2008).]