You won't have to take the tunnel modifications back as far as they did with that late model tunnel, but they do have to go back pretty far. Mine goes pretty much all the way back to the front of the floor reinforcement for the rearmost bucket seat mounts. The removable panel behind my shifter is open in the center so the shifter (not the handle) can be in place when the transmission is installed or removed. I did that so that I could install/remove the transmission by itself without having to angle it down like 1° at a time while I was sliding it back out of the bell. Otherwise the shifter stub would hit the tunnel. The way mine is set up it can come pretty much straight back until the input shaft is almost entirely out of the bell before you have to start dropping it down. If anything, if I were to do it again I would probably take that opening back another couple inches.
View attachment 1716347559
View attachment 1716347560
I run the A-body console in mine, it sits further back than the factory location to line the shifter up with the console. Doesn't leave a ton of space for the Procar seats, but there is some.
View attachment 1716347561