It isn't sleeved - you might be able to find some older threads talking about the ingenious way the block was cast for reinforcement... You could probably get o/s pistons but I doubt that you'd need to have it bored. At 145k, my cylinder walls still had hatching showing. You may need new (stock size) pistons and rings (The softer, OEM-style ones). Put in new timing gears and chain and tensioner. If it has aluminum-backed rails find replacement rubber if plastic, just relace them all.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2024 CR-V Hybrid

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1972 280SE 4.5
2018 Durango R/T, 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k