[MOTORHEAD]

Foghorn:
The FE intakes present a unique fitment problem because the intake bolts enter the head at a 90* angle as opposed to vertical as are the small blocks. Thus when tightening them, the bolts are pulling the intake toward the heads and in opposite directions, one side to the other. With intake bolts going down vertically, the intake is drawn tighter as you tighten them, as the angle of the intake and head interface causes a "wedge" effect that squeezes the gasket tightly.
Barry R at Survival Motorsports has a book available that covers FE assembly, and has a lengthly procedure about measuring the intake to head fittment prior to assembly so that the chance for leaky gaskets ( or cracked manifold) is minimalized. It's a must have for anyone building an FE. (IMHO)
Ted