Thanks for the clarification, easy fix for the first pic, will weld up, as I assumed those must have been where the dual exhaust was hung.
2nd pic I'll research the turn downs.
In regards to the firewall, the large hole below #14 was for the aftermarket alarm, it was a cable that ran to a sensor on the hood, so that I'll get welded up. As for home #14 itself, I think I'll just fill it with bondo in case I do need it.
Thanks to those that replied, I really appreciate it, you guys are the best.