Whats the history of the car?
Was it a daily driver before you aquired it?
What kind of records did your dad have for the car?
If you could compile a fairly detailed list of major service work, you might get a more thorough evaluation of what the car might be expected to require; in terms of 1) parts prices and 2) time with tools. Short this list, a PPI by a good indie, which you don't seem to have, can be a good reference to work from as a service history.

I guess it will take some reasearch to find out. Always good to know what you are getting into before you start throwing money in there.

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html