Here's my question, if you have gone with a hydraulic clutch, why would you want to leave an overcenter spring in? Why did you go hydraulic in the first place?
Car will be converted from auto to manual so I was free to choose what type of clutch actuation method I want to have. Basically it doesn't really matter if its a mechanical (linkage, cable) or hydraulic type - they all do the same: convert the pedal movement to clutch departure. If the tip of your pedal moves 8 inches and your clutch lifts 0.050" from the flywheel you have a certain leverage (160:1 in this example) - no matter what type of actuation. It is my understanding that you can divide the clutch pressure (2600 for my pressure plate) by the leverage and get the force (2600/160 = 16.25lbs) necessary to press the pedal.
The over center spring is just there to help holding down the pedal when running pressure plates with high spring rates (which diaphragm clutches usually don't have) - totally independent of the clutch actuation method.
