I just did this mod and the hardest part was getting the back socket head cap screw out because i didnt have a ball end 5mm allen wrench.
Den - Dodge CTD 1st Gen - VE Governor Spring Install
plus this information from Jimbo486 will get you though it.
"use alan keys with the ball ends. you can access the upper right bolt on the pump top without having to remove the idle screw. the bolt won't come out of it's resting place, but just keep a hand on the pump top for when you get down to the last few threads and it's free. from then, you can push the throttle shaft through the top so that the top will then be free and you can then remove the governor spring easier with both hands. or you can have someone hold the pump top while you work on unhooking the governor spring. when doing so, as you may know already, keep a finger on the "top hat" that the governor spring is hooked to. otherwise, if you drop that, you'll be fishing for it or even worse, removing the pump to get it back. once you're done, you'll realize just how easy it really is. i was hesitant and little worried about doing mine, but as soon as it was done and everything tightened up, the truck ran and still does run just fine! and of course, even better with the 3200 spring."