[Chevelle-list] Oil Pan Gasket Leak

[jww1945]

I noticed a small leak on the bottom of my oil pan this week.?Car is a?'70?SS 
454.? Tightened the bolts but still leaking and I can see parts of the gasket 
sticking out suggesting it is broken.? Leak appears to be coming from the rear 
of the engine dripping down the flywheel cover plate.

What is the easiest way to replace the gasket?

Any way to fix this without pulling the engine??

Thanks,
Jerry Wells