Well, the rails on the left are also metal. I'm only going to replace the tensioner rail.

But the tensioner rail visibly pulsed in and out while turning the engine over. I only have 5deg of stretch, though. Still, should I at least consider a new chain? It looks like it has quite a bit of slack.

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

Previous:
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