I have been following this post hoping to learn something as deciphering these rods can be really difficult. I have posted a picture of what I tagged a while ago as a small block kick down rod, but I don't really know what the actual application is. Compared to the one above, It is pretty much the same length, but seems to have a little different bend locations.

The NOS kick down rod part number 3577529 in the previous post, according to the parts books is the correct part for the 340-6 AARs and T/As.

What's is interesting is that the part number 3577529 carried in to 1972 model year and was found on B-Bodies with a 318-2 engine.