[jhv48]

If it's a pusher slave, there is an internal spring that will push the rod firmly against the clutch fork, thus putting pressure on the throwout bearing.

If you want to create space between the slave push rod and the clutch fork, then you will need to change to a puller (wilwood type) slave and mount it to the engine block.

The pusher slave does not need an external return spring (unless you really want to install one). If you are afraid of throwout bearing pressure, then you should change to a puller setup.

The type you have are used on all SPF's and the t/o bearing is meant to have continual pressure on it. Ten million mustangs can't be wrong!