Regarding clutches: They will last far longer than most people will believe - if driven properly.
I probably didn't really understand how to drive in order to make the clutch last - until the first time I replaced a clutch. Seeing exactly how it works made the difference for me.
I replaced the clutch in my '86 5.0 Mustang at a little over 200K miles. And was shocked to discover that it was nowhere near the end of its life (I replaced it because I figured it had to be worn out and didn't engage as well as before; I later came to the conclusion I was feeling the effects of a now-overly-smooth flywheel).
BTW, I was surprised enough that I measured the plate, and took pictures:
clutch1.jpg clutch2.jpg clutch3.jpg After 200K miles, that's still 0.046" of lining left above the rivet. Based on measurements from the new clutch, it was probably only about half worn out (if you presume "rivets rubbing" is worn out).