Here my two cents, and I will qualify that with never having played with engines at that level, but from an outsiders perspective of those power plants...

The Hemi 99 as awesome as it is has a number of variations in design, if the parts chosen end up being the earlier version, problems with reliability abound. So unless you have someone that can guide you and review parts before purchasing, I would avoid this combo.

The Predator combo is probably a better platform to start off with, less variation in design, and proven on the street as well as at the track. The issue you will still have is, a 10x28 slick is going to be an issue in getting the car off the pad. You need to have a plan for getting four digit horse power to the ground on a small tire..and a chassis that is tried and true with adjustability. Your going to have to adjust your power output for track conditions and have a serious set of kajones to hang on..