The weights of the K1 (820) and Molnar (849) rods I got from the manufacturers. Ohio Crankshaft was the only I-beam 440 rod I was able to locate and when I called them was told they are out of stock, as well as their H beams. I am not sure what the weight of that Ohio Crank I-beam rod was though. Below is the thread here on Moparts referencing the 440 Source rod as 735-745 grams and it is a relatively recent thread. I apologize if it doesn't show up as a link but I am not too computer savvy. I may try giving them a call to see what they say their rods weigh.

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2925780/6-760-h-beam-rod-weight.html