Have to rering an perfect 1985 at, ac, sunroof, 150k miles, almost perfect except pumps oil through both valve covers, changed pcv, checked egr etc. believe needs oil rings,,,about 1 qt per 100 mi. pumps it out....

Only very minimal differences, not really worth it if you ask me. Rebuild the motor and it should run like a new one again and you wont mind the emissions.