I have a pre-66 model 110 left handed rifle I found in a pawn shop a while back. Spectacular trigger, lovely fajen stock, barrel direct threaded into the action with no nut.

However, the barrel is now shot out. I alhad it bore scoped and it is dark, pitted and eroded almost the entire length of the barrel. It currently shoots 2-3 moa no matter what I do.

So, on to a rebarrel. I have 2 options that I can see:
1) buy a blank or prefit and have a gunsmith fit it. Figure $300 for a barrel and $200-250 for the work.
2) buy a prefit and a barrel nut and do the install myself. BUT, if I do that, I need a new style bolt or to convert mine to the new style.

If I go that route, I'd need a complete bolt head, a new style bolt body and firing pin for sure. Are there any other parts I'd need, or can I recycle the rest of my old bolt? I'd need to remove the old ejector from my magazine box, but that that's not hard.