The heads on the 86 are pretty restrictive and not worth modifying. Without that piece, your new intake will likely produce a net loss of power over the useable RPM range.
The way I see it, you have a few options:
Convert to Mass Air, Install Trickflow Twisted Wedge heads and intake, New Throttle body, fuel pump, New Exhaust, Tune
--or--
Throw a blower on it, fuel injectors, fuel pump, fuel pump voltage regulator, Tune (my personal favorite)
--or--
Rebuild the motor with whatever piston and head combo you like.