Nope, there's no way to overtighten the pressure plate bolts, short of twisting them off. I believe those bolts are 3/8" X 16 thread, which would take about 35 ft/lb torque. They might be 5/16 X 18, which would need only 20 ft/lb or so. The 3/8" bolt will have a 9/16" head, while the 5/16" bolt will have a 1/2" wrench size.
Try disconnecting all the linkage and moving the throwout bearing into contact with the pressure plate fingers with the fork. The area where the fork meets the bearing should be approximately parallel with the back of the pressure plate if the right bearing is installed.
Jerry
