440 HP(Six pack rods)

I have an virgin 1971 440-4bbl out of an R/T Charger. It has the Six-Pak rods. It has an counter weight on the balancer. The counter weight is not as thick as the cast crank balancers. Does anybody know if they used a counter weighted T/convertor? I had read that the 1970 & up 440's all used the Six-Pak rods.
You could always sell the recon Six-Pak rods to someone doing a resto & do the earlier LY rods.