340 rods

So far as I can tell, from my rod collection and tear down inspections,from 1964 to 1972,I have only seen two types of OEM sbm rods, and two types of little-end treatments.
The little skinny 273/early318 rods, and the more robust 360/340/late318 rods, which Ive seen both unbushed(360s), bushed(340s), and both in 318s.In my collection, the skinny ones IIRC are all floating.
There may be others.This is just all I have seen.
I took a set of the more robust,unbushed 318 rods and stuck them in my 360, after having them bushed. These rods had the same casting numbers on them that the 340 rods had.
Personally,I wouldnt put those skinny ones in anything other than a 273, or perhaps a lo-po 318 with light-weight pistons. They appear pretty marginal to me.Just my opinion.