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Egge Machine offers 413 hyperutectic or cast pistons in standard and I think a couple of over-sizes. Forged pieces might have to be custom made,depending on bore size. Going .060 over in the bore takes you to 4.25" and there may be more piston choices for that bore size. Bearings(rod and main) would be standard RB pieces(413,426,440).
A lot of big-block freaks here;you'll get good advice.
There is a guy on E-bay that has a set of cast, coated pistons with rings for $418 includes shipping. Look at "Chrysler 413 piston". They carry the same part number as Egge's. They are made by "Rebuilders Choice". Bearings are available anywhere they are the same as a 440.