Will Brothers could fit them to your gun. That’s a beautiful stock, BTW. Shoot some appropriate shells at a pattern board and see what you have.

The barrels are a very nice Parker D4 4 Iron "Turkish"
It would be wise to send the original barrels to Will Bros. to assess the integrity of the 'inexpert' rib repair, careful measurement of the wall thickness, and opinion regarding the pitting. The problem is that it is impossible to measure the depth of the pits without a very expensive ultrasound apparatus.
They should also check the head of the stock and check and clean the action.

Channing Will, in my humble opinion, is a capable, honest guy.

The barrels in question do not have a cocking hook and screw, nor do they have a 1910 bolt plate and pin. The hunt is on. Can anyone help?

I've found that when 30s are cut down to 26 the walls are generally too thin to choke tube the gun. But they could determine that. For the same price one could have a set of Briley tubes installed that will give the option of screw in chokes in 20 gauge, and certainly the gun could then handle not only one ounce loads but even the short magnum 1 1/8 ounce 2 3/4" loads. Then one could also remove the tubes and shoot 12 gauge low pressure stuff. The advantage of the 20 is one could shoot off the shelf ammo in it.

Thank you everyone for the help thus far, I really appreciate it.

I think I am going to contact willbro’s and discuss having them assess the barrels & make a decision from there. I’m 50/50 on keeping the original barrels or getting new ones.

You would be well served to do both. Keep the original that are cut and fit steel bbls to it for all around hunting and such. Just mho

Great advice here

My thought is you will be well served with the original barrels as they are. An extra set gives you more options to match gun to game. A friends Grandfather ordered a AAH in 1897 with Whitworth Steel barrels. Over the course of ownership he had Parker make four other sets of barrels. All were Vulcan Steel.The point is your a DH sporting VH barrels is quite Parker.

Were you planning on flipping it or keeping it? If you are going to keep it , it appears that a 26 inch barrel was ok for you. If you hand load I'm more than sure you can come up with a load with the right wad that will get you out of Cyl territory. It's not going to get you a full choke but I'm sure you can find a combination that will give you a tighter pattern.