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You'll be fine with those pistons. Seems like a can of worms but when you discover a new process there's a great sense of achievement and it bears no horrors for future attempts. Have been through this many times with an old Z I'm restoring.
Plus the cost saving - theres lots of helpful youtube stuff for this sort of process plus lot's of guys here who'll help. Hope it all goes well.
Where are you now?
How much corrossion, more than a scotchpad to clean?