I read an interesting article that detailed a lot of what went into a 9800 r.p.m. SS/AH motor and it was pretty remarkable.
Narrowed cam bearings and re-located lobes was the part where I physically felt my wallet cringe in my back pocket.
Spreading the lobes nearly 1 " also required custom bedding and rocker arms , and had to oil the valve gear through the push rods.
If you can dredge up a February of 2011 MoPar Action , it is pretty interesting.
And 8 years old. God only knows what they are doing now.