1994 Other Mercedes Benz Models 1994 Mercedes E320 - Overhea

I have a 1994 Mercedes E320 with a possible cracked head causing overheating problems. Estimate to repair - $3800-$4800. W/in last month replaced water pump, thermostat, radiator, belt, fan clutch thinking this was problem @ $1200 expense. Problem continued. Now we know what the cause is! But, at this expense and the age of the car.

Do I repair or sell for parts?

Car is clean, no body damage, rebuilt engine at 90,000 miles by previous owner. Total miles - 141,000 (including above 90,000).

I am 3rd owner.