I would satisfy myself first on quality of parts, machining and assembly than worrying about the pistons. Those pistons aren't "bad." It is the details inside the engine you can't see that I would wonder about. If you need a driver and all is good run it, and don't change the pistons. I rebuilt a 400 over 20 years ago with them and 1969 46 small valve heads. Its good with 87 octane in WA and 85.5 in MT. I have cast rods too gasp. : )
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