It gets in the way to the IP mounting bolt below. The one at the back lower bracket is hard enough to get to...

The 85 617 is a vacuum line mess.

BTW, This would be on the 300SD is just picked up. Black/grey, 177K miles.
This weekend I'm doing a valve adjust and checking chain stretch, ip timing, fluids/filters...
It looks like I'll be doing guide rod bushings and brakes. Otherwise, she's in good shape.