Mountain motor Mopar

I read somewhere ( For the life of me, I cannot remember where ) that one of the Mopar engine vendors was working on developing a large cubic inch Mountain motor for I believe Pro Mod or IHRA Pro Stock use, not sure if it was a Hemi or Wedge design, they were looking at somewhere around 800 + ci. Does anyone have any more info about this venture.

I was talking to a brand x racer who just laughed. he claimed you will never see a Hemi that large because of piston weight issues. I would love to prove this Jackass wrong.

One more thing, it was not a Rick Jones Ford style Hemi.