How fast can you go with a Magnum? Who has the quickest setup?

So it seems like a set of heads, cam/valve springs and the right intake can pretty easily get you into the 12s but how far can you go with this platform?

From what I gather, the LA 360 has some advantages at the higher end over the 5.9 and I assume that the same applies to the 318/5.2. Have you found that to be the case?

Who has built a beast out of one of these motors? How did it go compared to other builds? Which bottlenecks show up first? At what level do you need to get into the bottom end of the engine?

Alternatively, who is planning on building a monster and what's your plan for getting there?