[Mark IV]

Understand that FE intakes vary dependant upon the car they were originally installed in. Early 60's Galaxies had the engine installed with a very noticable angle towards the rear. Thunderbirds were almost level. Therefore the angle of the carb mounting plate will vary. Using a C3AE 4V intake in a T-Bird requires the use of an angled spacer plate (Ford used such a plate and it was heated by water from the outlet atop the front of the intake that then routed to the heater core).

Mustangs and Fairlanes had almost level mount engines, the point being that your intake may require an angled spacer to reach the correct mounting plane (slightly rising at the rear).

Aftermarket intakes are all over the board dependant upon what car they were designed for. The "XE" intakes on the GT40 MK II and the MK 4s were almost level IIRC.