cam and carb question

I personally don't understand why so many people recommend the 340 cam. I'm sure it works well performance-wise, but a modern split-pattern fast-ramp high-lift low-duration (wow, lots of hyphens) cam would give a broader torque curve and better gas mileage. Something like the COMP C130 Chief mentioned or the Lunati Voodoo 250/256 or 256/262 (which is going into my 318 in a little while).