I'm not all that familiar with that particular one, but generally it's a pretty easy installation. It's a simple vacuum dashpot that mounts to the carb with two screws on its bracket. The linkage is held into a slot that allows it to slide with a simple circlip, hopefully your new pulloff comes with that circlip as it's very easy to lose the little bugger when you take it off. Then there's a vacuum hose to tkae off and reconnect, and that's really about all there is to it.

Here's a link to a PDF file with some explicit instructions and pics. Scroll down to page 4 and 5 for some detailed pics of the pulloff and its removal:

http://www.kansas4xford.com/Tech/2150%20rebuild.pdf