Your title says clutch assembly, but you're inquiring about pedal assembly. IMO you might want to add the word pedal to better attract your target audience.Notice you're on page 3 already with 71 views but no responses. I have a feeling those viewers came, looking for a clutch.If you're unfamiliar, the clutch is bolted to a part of the engine.
If you're sure about getting a diaphragm clutch, then you can sacrifice the HD pedal assembly, otherwise I vote to keep it, unless offered a good buck for it. Your next clutch if there is one, might not be a diaphragm.