i had a MBC but decided to properly adjust my wastegate one day to tidy things up a bit. i remember the MBC would sometimes allow the boost to spike pretty high? now it will hit 14psi on a hard kickdown. kinda a pain to get the "tang" popped out on the wastegate at first. clean with brake cleaner and take some pics with your phone or something so you can see where it is and which way to pry from. i slightly bent mine for easier removal. this is on a om617 with a garrett turbo btw...

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect