Gear Vendors in a '67 Barracuda, is tunnel clearancing required?

If a manual trans;
1) the adapter they sell you is for a long shaft, So you have to convert your tranny.
2) the adapter has both B and E body shifter pads on it so you have to saw the top frontmost pad off.
3) the driveshaft will have to be shortened.
4) because the unit puts the rear yoke quite a bit further towards the back, it messes up your driveshaft angles. My partial solution was to jam the unit into the floorpan and add shims at the rear trans mount. By jamming it in there I found the witness marks in the tunnel,and,after pulling the unit down, I carefully pounded out an area suitable to receive it. Of course this required clearancing that front pad again.
5) is the shifter; the factory one won't fit any more. You can fabricate an adapter to bring the shifter back into the floor hole, or you can take this opportunity to move she shifter back between the buckets. Of course that will then require new shift rods.
6) is adjusting the pinion angle cuz now it's out of whack too.
7) is the speedo. They supply an adapter to take the drive from the GV but you have to get the right GM speedo gear.
8) is the special oil you need to run in it. Buy extra.
9) is locating and wiring their ECU, and that ugly-azz truck shifter

If an automatic
skip 1,2, and 5