[sick472]

I am seeing some pitting in your photos. Is that all that you are refering to when you say they are not in good shape? Cracks and warps are what make manifolds "not good".

I would not hesitate to sand blast those and reuse after removing and inspecting those areas for good thickness and checking the mating surfacces for flatness.

If you are concerned about the appearance alone...get some new ones if available.