There's a Swedish company making individual runner efi setups, owner of which is a diehard FE guy. He has developed a setup for FE, which has the intake runner block, 8 throttle bodies and valley tray. Requires the use of coil pack ignition.
Modified carb intake with tb would be cheaper & somewhat less drivable with big cams. However, just the sheer looks of a IR setup would be something.
One possibility would be to use weber intake (like holman moody) and weber IDA style throttle bodies to come up with a IR setup. That's probably the most common way to go IR.
-69 Mustang Sportsroof, 408W, 205AFR, 10.8:1 comp, Super Vic, mech roller, 1050UHP Dominator, FPA 1 3/4", 3" Magnaflow with X-pipe, T56 Magnum, Street twin, Fab9 35-spline, Wavetrac, 4.33:1