below are directions to replace intakes:
Note the location of the manifold bolts and studs before removal for reassembly in their original positions.
Do not disassemble the CSFI unit.
When installing the upper intake manifold be careful not to pinch the injector wires between the upper and lower intake manifolds.
See Figure 10
Fig. Fig. 10: Intake manifold bolt tightening sequence-1996-98 5.0L and 5.7L engines