You really need to get in touch with these people: International Comanche
Society http://www.comancheflyer.com/

Talk to a few A&Ps about TwinCo's. In addition to the ICS, there are
several TwinCo owners & A&P's that post regularly at
http://www.piperchat.com/forum/viewf...ca4a8dd6 a392

Purchasing any airplane is a complicated undertaking. If that airplane is
an older twin, your job just became much more demanding. You really need to
research all the airframe, engine, and accessory AD's, SB's, life-limited
parts, service difficulties, and common failures then apply what you learn
to some very thorough logbook research. A single recurring AD on an
otherwise seemingly inexpensive airplane could cause you to wish you never
saw the airplane in the first place. The ICS can lead you through the
"gottcha's" BEFORE you sign the check.

On a twin of that age and advertised at that sale price, I would set aside
NO LESS than an additional 50% for additional repair and maintenance that
you may incur during your first year of ownership.

Are you multi-rated? Have you investigated insurance? Has the airplane
been flying recently? Part 91? 135? Why is the owner selling? Has it been
hangered?
Good luck.
Jim