base cylinder seals leaking

[drola]

i am about to pull the motor on my 90 c2 to address the base seals. sucks because it doesn't leak from anywhere else. question is: when i pull the heads off should i have them machined for gaskets or just put them back on. they do not leak at all now but i'm afraid that i break the seal then maybe it won't seal up the same next time.
also, the motor runs just fine. oil consumption very minimal. should i bother doing a rebuild? or just change the seals and put it back together?
i am changing the p/s belt and seals, valve adjust/seals, cam chains seals, plugs/wires, caps, rotors, filters, cv boots, etc. should be good to go once it's done.
aside from this i figured i'll put a light weight flywheel and clutch while i'm there. PO said it was done at 48k miles
any comments appreciated

[drola]

oops - po said clutch and flywheel done at 48k, not lwf. now the car has almost 90k and i hear a clunking (not knocking) from under the car. i did the test for the flywheel as per the manual and i'm pretty sure that it's going bad.