Just an FYI. Isky makes hydraulic roller lifters for G3 hemis with either the typical needle bearings or with a bushing instead of a needle bearing. I know using bushings isn't anything new, but it is fairly new for the G3 hemi. They say the bushing is offered for more extreme applications, but it would seem to be a possible solution to the failures if they aren't too cost prohibitive and are durable long term.

https://www.iskycams.com/downloads/GenIIIFlyer.pdf