The design flaw in the dog legs was limited to the K-Mags. The issue cost Bear quite a bit though. They changed the design at least twice on all the bows that year (Type 1 and Type 2 Grizzlies exist) despite the fact the actual issue was only on the K-Mags.
I have owned Dogleg Kodiaks and Grizzlys. They are TREMENDOUS shooters. I think they are faster than many other old bears. If I could find a LH Dogleg Grizzly I'd snap it up myself, especially if type one.
If it looks like a sound bow I would enjoy it for sure.
I would not shoot a 1963 K-mag though!