Excellent writeup, i planned on doing something like this, after someone posted about the ultimate TBI mods in my TBI spacers are they worth the money thread.
I am still likely going to do a spacer too, but plan on making itbonly 1/4" to 1/2" thick out of phenolic sheet material, just to isolate, and insulate the TB from getting heat soak off the engine.
Taking the spacer off under the air cleaner looks like it helps too. Less restriction, cleaner shot for airflow. If i could make a auggestion, i would recommend sticking with the stock air cleaner. An open element one is cool looking but when the engine compartment it heated up, all your gains made in the TB will likely be lost by sucking in hot engine air.
I bought a spare air cleaner base and inlet hose at the junkyard. I plan on making mine a stock looking dual snorkle setup like the old 60s muscle cars. Going to cut and weld and have 2 inlets, one going into each fenderwell.
