Deleting the CAD requires a whole bunch of other stuff. I’ve never had any problems with it. I’m just replacing lines.I would junk what vacuum lines you can if you're already missing some. For instance, the 4wd transfer case sensor can be deleted, along with a CAD delete for the front axle. That's a boat load of problematic line right there.
I wish I could help you more, not familiar with an '87, but you are right, just fix the problem. The CAD works well if the vacuum system is right.Deleting the CAD requires a whole bunch of other stuff. I’ve never had any problems with it. I’m just replacing lines.
I can’t open what you posted?