I've run worse, but with solid roller. I agree with the others, just lightly sand the lifter bore. Don't try to remove the pits because you will get it out of round. Just get the high spots down and check it with a lifter.

I don't recommend this but I have seen a friend use epoxy in them and hone them back out with a brake cylinder hone. I've also heard of using epoxy in the cylinder bores to fill in rust pits. Hmmm, backyard rings a bell.....