The factory fuel and ignition systems on the 2.8L have a lot to be desired.
Most common upgrades are Duraspark ignition and an appropriate sized 2100 carb.
The thought of a reliable fuel injection system with a proper ignition system sounds like a great idea. I'm just not sure about the...
I think we may be onto something here.
Typically a missing anti rattle clip won't cause a consistent rattle with speed in my experience... but it could.
Before doing anything else... you should inspect and ensure that clip is on the inner pad as @tw205 stated.
I'm not completely sure... but the driver seat of a 60/40 split bench can be modified by pulling the cover back and cutting the "20" portion out of the center.
Several videos on the tube... search 60/40 bench seat mod.
I was in the same boat... but I'm not a big fan of the Bronco II or Ranger consoles. I also wanted a bit of security. I opted for a Tuffy console. They have an 8 inch wide that is really snug. I went with their 6 1/2 inch wide version. They don't give them away but it is a really robust unit...