Classic/Antique Car Repair: 1971 chevelle, pan gasket, exhaust pipes

Question
QUESTION:  a mechanic told me the car has a rear main seal leak and oil pan gasket...how
difficult is it to fix and approx. how much a job like that will cost? thank you

ANSWER: Which engine?
Brad

---------- FOLLOW-UP ----------

QUESTION: a 307 engine

Answer
It can be done in the car but it is a lot of work. Remove the front exhaust pipes, jack the engine up at least 2 inches, remove the oil pan and drop the ream main bearing. the seal can be rolled out and a new one packed in. It will take a good mechanic 6 to 8 hours depending on how the manifold nuts come loose so multiply that by your mechanics hourly rate.
Brad