Well I found the pedal controlled kickdown switch in the parts book. It's still available from GM Parts Direct for under $15. The problem is that I would have to go to the boneyard to find the parts that aren't available. That includes the passenger car style gas pedal asm and the mounting bracket. The application is '71-'75 all passenger cars with THM 400. Since most small blocks and 6s had THM 350s in this time period I'd be looking for big block cars or maybe a rare small block car that someone optioned up to the THM 400 for towing. I'm not sure what the '73-87 trucks used for a gas pedal. I don't have one any more to look at.

Anyway the Lokar is looking better all the time. I could spend more in gas trying to chase down parts that might work than to just online order from Summit.