The only Kodiak Magnums that you should not shoot are the 1963 "doglegs" type I & II. The Type III 1963 should be OK. If the bow has angles in the riser, it is a dogleg. If so, show it to someone that knws about them, or post a good picture here.
The Type I had bad crack-up problems. In an attempt to solve the problem, Bear came out with the Type II. It also had problems. The Type III solved the problems but Bear did away with the design and in 1964 they produced a new design that is pretty much the same as the Kodiak Magnums that are made today. One good way to tell is if the riser has glass on the back of the bow that goes all the way through from top to bottom of the riser, it is NOT a dogleg and is safe to shoot.
If it is a Type I or II dogleg and in good shape, it will have good collectors value. I would not shoot it. A Type III will also have a good collectors value, but is safe to shoot.
HOWEVER, Any old bow that has not been shot in many years should be approached with caution. Break it in slowly. Stering it up and leave it for a few days. Then try to flex it a bit, a little at a time. Listen for any strange sounds like cracking or creeking. Gradually flex more each time until you can get to full draw. Then shoot it from half dray, then 3/4 draw, and finally full draw. Once you have shot it from full draw several times with no problems, it should be good to go.