The $3000 (or $6000, if the chain fails) question! Mercedes 380sl Timing Chain replacement

Hi folks -- 100k miles and time to change the timing chain on my new acquisition. So the big question tomorrow when the valve cover is taken off -- is it a single or double row chain?  Single -- then I have a 3k repair bill ahead to get a double row conversion done.  Double -- I get home with a much smaller repair bill. I was told today that just to replace the single with a new single chain may be a very incomplete and tenuous repair. New chain may snap at any time. Boom goes valves and pistons! And unless we remove timing cover the guides won't be replaced, and that does need to be done.

May need to bite the bullet!  We shall see!