Balls!
Replace the whole dam thing if you can swing it. Sock is packed, pump is rusted on the outside. (with heat indicators)
In that knowledge water is pervasive, and everywhere. (double-double?) Existing fuel tank is a collective rust generator.
Replace the tank if you can find a...
Cheese and crackers brother! Headliner looks great!
lol
Tell me, if still in place what is the catalytic converter arrangement?
I see the short shield in pic #2.
Do you have a single cat with 2 in/1 out?
Or 2 cats, with 1 in each and a combiner thereafter?