99 Hemi stuff is becoming harder and harder to find. Just went through this with a fellow board member who was trying to locate one. Took alot of phone calls and finally found a customer of a builder that had a spare he was willing to part with.
IMO as I said earlier a 1200 HP BB Mopar can be done. Yes even a single cast 4 can be. A 655" 600-13x deal should get you really close. We have one in bracket mode that makes 1100. We have done a couple Predators that were in the 1150 range with a single 4 so again not full tilt deals but not exactly typical bracket stuff ether. A PSO or TS deal can likely get there as well. Bottom line there are options if you are willing to go out on that ledge and spend the money.