Ok, I have an 89 heap of an integra. The PO didn't have the $$ to maintain it properly, so it runs, but not well.

Whats been done:
Quick tune up (minimum driveable) by the mechanic
- new plugs and wires
- fluid change
- minor other things

Problems:
Leaking oil into the air filter, but not quickly
Clutch is about shot (new one purchased)
Runs rough

I'm gonna be tearing into the front end for the clutch, what else should I do? What could be causing the oil in the air filter? Anything I should do on principle?