You have three options as I see it.
One is have a gun smith look at it and advise.
Two is try to straighten it yourself.
Three install sights and abandon the idea of mounting a scope.
The question that comes to my mind, is it useful as it is? If the action is not useful as it is today then please select from option one or two.
There may be more problems than anyone can see with just the one angle provided and even with more pictures problems may still remain undetected. Only you or someone who can put their hands on the action has any hope of spotting any additional problems. Take your best guess and remember, "Only you will suffer if you guess wrong".