Diaphragm vs. Borg and Beck.............

694spd said

.......... What happens if you leave it in and go with the diaphragm type clutch?

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Not a diaphragm know it all person but I believe it can/may cause the release bearing to ride on the diaphragm constantly. Constant pressure from the spring on the diaphragm (or fingers on a B&B) can hamper the clutch plate performance and cause pre-mature release bearing failure. Kinda' like riding the clutch IMO.
For a B&B, the spring acts as a an assist for the release of the plate when depressing the clutch. As you let off it lifts the pedal back up to the stop to assure bearing to finger clearance when adjusted properly.