I used them. They are the sight to use on old guns. Now, depending on which sight you get will depend if you have to hack on your rifle. They should have one or two models that replace the rear blade sight you have, but most are attached to the rear receiver and usually involves drilling holes in it. If it already has holes drilled and tapped, then your gtg.
Me personally, I wouldn’t do that, I’d look for some that could be installed without hacking on it.
Isn’t your engraved and cased color hardened? And what kind of rear sight is on it? A buckhorn?