Based on previous references, I'd hafta guess the 62070 is a typo/aberration. The 1979 Publications Guide lists the same service manual number (63829) for all of those similar models prior to being superseded somewhere along the way by 60270. It's highly unlikely that McCulloch would have published a service manual exclusive to the 380..., at least imho. On the other hand, maybe the 380 service manual was listed incorrectly in the 1979 Publications Guide and should have been 68329? McCulloch
did do some pretty weird things, including providing conflicting/confusing information on occasion..., (just to keep us on our toes, of course).