The 12-bolt is a VERY good rear end, but it's a half-ton; you have a 3/4-ton truck. Not only will the wheel bolt patterns not match, you'll loose capacity and ride height. Spring mounts may be different--I don't know--and in different places.
What little I can say without seeing pics/knowing more.
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'69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.
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