Honestly if you don't have the tools an parts to fix it I put it on Gun broker as is . let some one else fix it. someone will pay to much for it.
I would put it on a new recvier . Id cut the weld at the trunion on a lathe an press out the barrel an toss it .
if the gun can be fixed its likely worth $500 or more in todays world. Its going to be gobbled in some way no matter what you do. back when parts were cheap id have kept the bolt an carrier an what ever else is un molested an junked the rest.
your not likey going to hurt the value by demilling it so that's the first step. before you do get it head spaced an figure out why its not firing . if the round is chambering an you rgetting a primer strike it should go bang.
also the barrel looks pinned why is it welded to the trunion ?? Drive the pin out if its actualy pinned an see whats going on. it might be plug welded If its plug welded then junk the trunion IMO