Yeah, I've seen the 3.8T swaps, but not a 3800. I had an Impala with the 3400 a while back, and my dad still has one with a 3800, and the engine mounts are going to be a REAL chore. Possible, but completely one off. And I don't even know where to start with harness, I would probably say find a 3800 camaro harness to start with then start cutting.