In order to use a pre-fit barrel you'll have to replace the bolt with a post-67 unit. The older style has a snout that goes into a counterbore in the chamber end of the barrel. The older style also uses a standing ejector that is attached to the mag-box. You'd have to replace that as well.
Or, you could purchase a pre-fit and have a gunsmith machine the correct protrusion and counterbore for the old bolt.
Or, just have a gunsmith set up the barrel from scratch.
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