Hi all, been a while since I posted on here but I need your help.

Just bought a 1971 250C with rod knock. The car is beautiful and runs but has a spun rod bearing (presumably). I'm wondering what my options are for engine swaps, as I don't want to rebuild the current engine if I don't have to. 280 model engines seem to be the most plentiful in the used market, so would it be possible to swap in one of those with little modification?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles