hemi advantage?

The Hemi chamber by design has more of an advantage in flow in the mid-to-upper RPM range and it is actually not very hard to achieve 100% volumetric efficiency from a lightly modified 2nd-gen Chrysler Hemi. You can build a wedge that will make the same peak HP/TQ numbers but they will more often than not be at a lower speed than the Hemi and will trail off quick after peak. The Hemi kind of just keeps making torque the higher you spin it, hell the factory redline was 6500 RPM and they were made to be able to rev past 7000.

Moneywise it's still almost always cheaper to build a hot wedge than a Hemi but to answer your question yes, the old Hemi heads still have advantages over the new aftermarket wedge heads. HOWEVER they also have disadvantages, main one being pretty bad combustion efficiency at lower speeds esp. with those giant domed pistons obstructing the flame travel across the chamber and the lack of any squish areas on the old-style chambers. If you look at the new (3rd-gen) Hemi chamber it has squish pads added on the sides of the valves as well as two plugs per cylinder all to help speed up combustion at lower speeds and help fuel economy and emissions.