Not really related to your engine. On my m104 I did the head gasket and had the machine shop do tge guides and seals. Expensive but it was night and day. It runs like a bran new engine. I’d say go for the gusto

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1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero