MMO isn't going to help. Water got in the intake, which resulted in the rods bending (assuming it was running at the time or an attempt was made to start it without storing it in a dry shop for a month or so)...

The only way to unsieze it is to replace the rods, but the cylinders may be badly damaged, the crank may be bent, and the pistons are probably screwed up too.

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

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1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k