Looking for info on 2406782 rods

Lighter... used in 273'and early 318's. Not used as factory rods in 340's. 726 grams average versus 758 grams fore the heavier rods. Not a lot of difference but it is pretty much all in the beams of the rods. Just my SWAG..... probably fine up to 325-350-375-ish HP.

With that off number of rods (13), see if you can find out the history. If reman rods, you don't have any idea if they were rebuilt right or not. I've looked at one batch of reman rods and found the length varied by .019" over the lot of 8 !!!! I did not buy them....

With those KB pistons, you're gonna need to re-balance that 360 crank regardless of the rods. If you get desparate for rods, consider springing for some SCAT I-beams. Good strength, and much lighter. You can then internally balancing that 360 with the lighter KB's and those lighter rods.