If you'll look back through the pictures in post #12 I have a picture of my oil pan. The car is setting on car skates, so you can't really appreciate just how low to the ground the pan would be setting, but it would only be about an inch or two from scrapping.
As far as the exhaust, I plan on using these LS2 C6 manifolds in the short term:
Routing from there *should* be ok. If not, there are several other factory manifold options or even custom headers if all else fails. It's kind of hard to appreciate in my photos, but there really is a ton of room on the driver side for exhaust routing. The passenger side is going to be the tough side, the starter is going the obstacle.
Really...with the SBC the trouble side is the driver side. The easy side for me is the passenger. That oil pan looks huge. Mine isnt nearly that deep. Good luck with everything.