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These? http://www.summitracing.com/parts/slp-424np60/overview/make/chrysler

I think I used Ohio pistons. I would have to go through my receipts. But, yes, that looks to be the proper pistons. It still looks like a pretty good , low cost way to get decent compression in a 400. One member here(Jyrki, I think?) used the 2266 piston in a 400. The 2266 will end up out of the hole on a 400 and will require some mods to work.