Should I use the 67 single shear K frame?

I am in the process of cleaning up a 71 Demon drag car and have the K frame out because it had the engine mounts cut off. I need the mounts on the K frame to install my small block. I also have a 67 parts barracuda and it has the K frame with the single shear idler arm.

Is the 67 design safe to use? The idler arm seems pretty tight but I don't like the way it is bolted on. This is purely a drag car and I hope it will be getting the front wheels in the air.

Anybody have a facts based opinion on if I should use the 67 frame and idler arm?