What is the deal with Gen 2 Hemi blocks?

I would like to stay with an iron block but have not considered an Aluminum block. I do not know what differences I would have to prepare for when building from an Aluminum block. I have spoken to reps at Summit, Mancini and World and generally, the information I was told, was that World was casting them for Mopar and then a dispute between Mopar and World happened which led to World telling Mopar to find someone else to supply their blocks. Years later, still nobody is producing them.