Me too. Needle and seats vary on what they can handle. Some will take as much as 9 but generally you shouldn't go over 7-1/2 psi at the most or you risk blowing the needles off the seats.
RockinRobin, why so little timing? By the sounds of the low rate power valve requirements and huge carb your in the territory of generally having to run A LOT more timing than 6 degrees initial, and 24 total sounds pretty low unless your running a healthy shot of NOS. If you could post your engine specs it sure would help give us more of an idea what your even working with. I don't know new Hemi's so maybe I'm off base here but IMO the engine would have to be extremely efficient to only require that little timing advance