Randy,
If by flex plate, you mean the pressure plate, or as my service manual (96) calls it, the clutch cover, here it is:
cover bolts must be tightned evenly, a few turns at a time to avoid distorting the cover. Tighten 5/16 in. diameter bolts to 23 N-m (17 ft. lbs. )
Tighten 3/8 in. diameter bolts to 41 N-m (30 ft. lbs. )
If were not on the same page let me know and i'll look it up.
Rog