I don't think we did a right up I helped toasty pull his apart. Kinda going from memory it was a couple years ago but once we got it torn down we removed the rail and butter flys/bushings and vacuum diaphram then where the vac diapham connects to the plenum we sealed the hole up. Its pretty easy once you get it apart you'll know what mean.

89 2 dr turbo diesel
89/88 "Backwoods sas"