I have been admiring a friends' car (1981 505 TD 5-spd) for several years and asked that, if they were to sell, please let me know. Well, the car didn't start for them yesterday morning and they called. I looked it over more closely this morning. It is in decent shape. The IP has been leaking, and I suspect it needs a rebuild. The car has about 300k on it. But I think I can buy it very reasonably; they want it to stay on the road... Any suggestions on what I should look for. How much for an IP