The correct cam bearing have to be ordered because there are undersized bearing for this application but finding them are like hunting for hens teeth. When this engine was new, those bearing were available for purchase.
That said, the standard bearings would need to be measured as well as the cam journals prior to honing the bearings. Now the old trick of cooling/freezing the cam prior to installation. In theory the camshaft would clearance smaller due to the metals reduction due to the cooler temp...
Sometimes best to let the machine shop perform that procedure.
https://www.youtube.com/watch?v=omyB6asi3o4
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