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See link, fule lines removed, the four fasteners that hold pump in the block are removed, and the link # ***** has to be unhooked through the throttle linkage hole. Pump just lifts out. The shims / gaskets under the pump are the timing shims. Keep them together for replacement.
Why do you need injection pump?
The # ***** elements are the working parts of the injection pump and can be replaced without removing the pump.