Dropping oil pan in the car

[oldspert]

It has been over 60 years since I worked on a Model A. Question is can I drop the pan with the engine in the car? Does the oil pump fall out when the pan drops or is there a way to keep it in the block? I just recently bought a 29 Coupe and it has a bad rear oil leak. Hopefully I won't have to pull the engine to fix the leak. Any help appreciated.