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Is there a difference between the GN 3.8L and a Cutlass 3.8L?

3.8L v6 in my '84, looking for some ideas of things I can do to increase performance. I don't want to swap engines, just make this one badass. They put them in the Grand Nationals so I KNOW it can be done. Lol this is my second GBody, my last was an '81 Mali but I never worked on it. Oh yeah...

Its got the 3.8L V6. Car only has 130,000 miles but, has a horrid oil leak. What could it be? I was told that it is a oil pan gasket leak, is that common? He also told me its a pain to change due to the motor needing to be lifted for the procedure, is that correct? Has anyone had this issue...