The Field is a great action IMO.
One other thing it has over the 1885 Winchester is that it is self cocking.

I would say that the lever has been reshaped as you can see the circular swath where the root of the original laid against the action. The only drawback is extraction leverage but on a 450 Carbine, it shouldn't pose a problem.
If the stock repair remains sound, it should last at least another 133yrs. These Fields are so reliable.