Cameron,
Do a forum search on LS1 Fuel tanks and you'll see several members have used the original fbody tank in their z's. You need to wipe out the spare tire well so you'll have to decide if it's worth it. Gives you the oem pump, regulator, fuel return, fuel level sender, etc., including the original push-on fuel fittings, etc. Could save a ton of adaptation, etc. It appears from the photos that the tank wasn't damaged (actually, I think I'm looking at some sort of sheet metal surround on the tank because the tank itself is black plastic).
Best of luck with the project.
Gary