Jeff,
Stealthee is right.. those 38s are a pain for shade tree tech.. not saying you can't; i'm just saying it may be the mom grocery getter, not the highway clipper anymore.. OR, it could have a very quick start and stop life..
if anyone were to make your bearing, it would be Michigan/Clevite 77..
if you can afford, it might be better for a crank kit; but if not, at minimum i'd get newer bolts and threadlock the 'p' out of them, as GM always built strong bottom ends for that 100k, zero maint.(in theory); so as close to 0 tolerence is best, or it won't be just rod#1..