5.9 Mag stock LB or rebuilt SB

Junkyard magnums typically have good bores, but the upper bearing shells in the rods take a beating when the plenum gasket goes and the engine eats oil. And they all did at some point. Most guys only check the lower shell and they look great. Also, the cam bearings on higher mileage junkyard magnums are typically garbage as @junkyardhero said.