Rusty Push Rods?

I blew a head gasket on the truck due to radiator/heater core problems. I removed the heads and intake manifold to be repaired (valve job)/surfaced. While everything was apart, I noticed about 5 of the push rods were rusty and pitted. Can or should I replace them with new ones? Does this mean I will need to replace rocker arms, lifters, camshaft as well. The engine is still in the truck. What can I do with this? Any help would be greatly appreciated. I have attached a picture of one of the push rods.