the spring goes from the fork to a slot aside of the starter hidden behind the tin plate on the front of the bell. When I am in a bind and can't find the correct spring I use the spring from the park brake lever under the dash.
The only time you need to remove the over center spring on the peddle assembly is when you use a diaphragm pressure plate. Otherwise the peddle won't come off the floor on a shift until the RPM's come down. We just install a diaphragm clutch in a Demon and had that problem. The borg&beck three finger style was not strong enough . The customer blew the clutch in a week shifting a 7500