What If Build Ideas...for Land Speed Racing

I hate to say it, but that sounds like an LS. With a big or small block mopar, I would think that an aftermarket block would be first step. I dont know if the gen three bottom end is as strong as an LS.
It sounds to me that the head flow of a gen three would be the best way to get there with a mopar.
An R5P7 with a forced induction would be the easy (not cheap) way.

There are people making well over 1000 HP reliably using the 6.4L BGE blocks. They are very stout, I'd bet at least as much as an LQ (iron-block LS) if not more. They were specifically designed for heavy hauling and towing in the 3/4- and 1-ton Ram pickups (BGE=Big Gas Engine). It's the most sought-after block for max-effort G3 Hemi builds.