My 380 SE was MFG. 2/84 and has a dual row timing chain. I was told that the change was made for the 1984 Model year. Hence I just had to replace the chain and guides. My Indy also told me(before we knew that it was a dual row chain) that single row chains are OK if they are changed out Around 70,000 miles. Had mine been a single row I would have just changed it and the guides out and then kept an eye out over 60,000 miles.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.