I thought about using an aftermarket deal for my setup. I'm really not all that comfortable with what I had to do, which is extend my kickdown to the very last two thread and rebend it by hand to get the correct angle. I'm running a Performer RPM intake (a very tall 2-plane) with a 1" carb spacer.

It is working for now but I'll likely take a piece of all thread, cut the kickdown part that is at the carb, and make my own linkage with the right geometry.

I've also heard the Lokar is a PITA but do not have personal experience.

What these folks do:
http://www.bouchillonperformance.com/
looks like one heck of a product but is out of my redneck/grass roots/phd student price range (yeah, I know those things don't normally go together, but...).