Removing seized Kelsey Hayes pistons

hemi71x said

If the pistons are F*&#@D up, pitted, divoted, rusted, scored, then you need pistons.
How many, 1, 2, 3, all 8, you won't know until you get them out.

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Do these need to be chrome plated or stainless steel? I can turn my own on my lathe but it wouldn't be worth it if I had to buy stainless or get them chromed. I'm wondering if just mild steel?