How many assemble their engines

Planning to rebuild a slant 6 225 out of my 64 dart. Still runs good but has a knock in the bottom end. I don't have what I need to pull the motor or the funds at the moment. Anyone know how to pull the oil pan while it's in the car? Maybe an easy fix if I could see the problem. I've tried everything I know besides pulling the pan off. Sounds like a rod bearing or wrist pin.