There is 18,500 miles on the car
Replacing all of the bearings at this point is cheap insurance. You can do it while the engine is in the car from the bottom without an issue. There are also MUCH better options than OEM for the Rod bearings, that are actually cheaper than stock. If you want a set, give me a shout.
I dont know what anyone else thinks, but IMHO, I think head gaskets are easier than timing cover gaskets, so long as there isnt a block defect that causes you to need to remove the block from the car.