Hey guys thinking about buying a 1991 350SD that has had the following work done.

The engine overhauled 50,000 miles ago, has all the paperwork, The pistons, rods and bearings were all replaced, The transmission was done 12k miles ago, The car has 253k on it. Has new brakes all around and new tires. The A/C and everything else works (windows ,seats , antenna, sunroof, locks. Paint is original and is in great shape. So is the interior.

What is a good offer price for this car?