The '69 doesn't have a switch under the gas petal (did someone already say that?). They're usually mounted on the carb.
So...when I finally decided to swap out my whimpy 2bbl Rochester and cast-iron intake to an Edelbrock 1406 and performer intake I had no kickdown since the old switch was made for the older carburetor. So I decided to opt for the lokar setup and spend a little $$$. Check out these two links:
http://67-72chevytrucks.com/vboard/s...d.php3?t=70874
...and...
http://67-72chevytrucks.com/vboard/s...d.php3?t=70868
One thing about what's cool about the lokar switch box. There's a couple of holes in your frame channel (on the driver's side) next to the transmission where you can literally mount the box INSIDE the frame rail. It eliminated the need to break the seal on the transmission to mount it there. All I had to do was plug it in, mount it inside the frame rail, run my wires ,and adjust the throttle linkage so the switch was activated JUST BEFORE wide-open throttle.
Piece-o-cake. Just make sure that nut on the cable is tight. Mine slipped a bit and I started kicking down randomly.
oops.