Piston question

I picked these up in a group of parts I bought recently. They are from Bill Miller Enetrprises. They were in 360, measure 4.03 by my very cheap caliper.
Wondering if anyone would have some kind of info as to what they might be. I called BME, they were no help.
Anyway, stock rods, 4.03 , 1/16th rings, floating pins

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