I don't know how remove and replace a cylinder head, I also don't have a garage either.

So massive jobs like that won't happen for while.

Also a full rebuild on Mercedes engines is ludicrously expensive.

You could build yourself a fully forged bottom end + aftermarket block V8 for the same price or less.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.