I'm trying to figure out if I can put a cam, bearing caps and rockers I got from an early 1990s 300sel 3.0 into my 1990 190e 2.6L. I ran out of oil driving up i80 on my way to Reno. Luckily I pulled over quickly before any major damage was done. When I got it home I put oil in and started it up, the engine nock went away, after taking the pan off and plastigauge the crank shaft clearances found it is still in tolerance.

It's obvious that someone had worked on the engine in the past it looks like the exhaust side of the head was machined so the S stamped in the side of the head is missing so I can't tell if it has a hardened cam or not. I also found that the bearing caps had been installed in an incorrect order the worst being #1 was on #6. #6 had a huge chunk of metal missing from right beneath the exhaust side rocker. The aluminum pieces where found in the oil. The cam is scored at the bearings . I need some advice , thanks

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1969 230 inline 6 dual carb 60,000 Miles 2nd Owner doesn't run right
1982 300 SD 455K - my reliable commuter car
1990 190E needs new crank shaft ran it out of oil
1996 C220 bad wiring harness