Install - Part 1
Figured I should add to this thread now that I have found a couple of shifters and have made the cuts to the floor of the 69 Camaro. In the past couple of years, I have asked about the cuts needed to install a day 2 shifter, and the general consensus from those who have done it was...you're going to need to hack the hell out of the tunnel. Well, that wasn't far off.
I ended up finding a couple of period-correct shifters which led to the project getting underway. The first was a used Super Shifter 3 that I used to mark up the holes for the floor cuts, and the second was a purchase I made a week later when I found a NOS Super Shifter 3 that was still in the box. Being that both have the H/D straight-armed shift rods that bolt-on at each end, I suspect each are early model designs from the late '70s to early '80s. Here are a few pictures of the NOS one before I get into the install.

Notice the high position offset mount (left) and the H/D straight-armed shift rods and tabs on the right.

The rods are threaded on each end and fasten with steel bushings, fold over locking tabs, and nylon locknuts.

When set up and adjusted, you quickly get a sense of feel for how heavy duty these shifters are. You can really bang gears with these.