I have a .030 over '74 440 that threw a rod in 2004. I have been tempted to buy a single new piston and a reconditioned connecting rod and screw the motor back together.
I am aware of the heavy six pack rods and their excessive mass, though I don't recall ever seeing them up close. I'm curious about the standard 4 barrel rods, since the short block I have was originally in a police car.
A side note: I am a little hesistant to use any of the rods in this 440 since it seems to have been a cursed engine. Besides breaking a rod, one of the rocker shafts from this motor snapped while in yet another motor. THAT was interesting... immediate loss of oil pressure and power after 4 lifters popped out of their holes!