It looks like maybe the entire vacuum converter (#84) can be removed. On my '85, this thing sits directly in front of the coolant fill tank.

Also, looking at the pdf for the EGR section, it appears that the entire EGR operation to control that single vacuum line to the EGR valve is snaked all over the place! valves here and there...temp switches, rod sensors, etc, etc..... I think if we got down to it, we could remove a LOT of the vacuum lines under the hood and maybe a box full of misc parts.

Chris
'85 300SD