Well the full Emerald kit is just over 2k using the original twin throttle ITBs, so I guess it depends on how these stack up price-wise individually versus the originals. Plus factor in £550? for the Mangoletsi manifold for a tip-top setup.
Don't know whether I'd say my Z is poor at low revs btw. Always thought it was perfectly tractable, although Dellortos have a more advanced progression circuit than Webers making them better for road cars. Then again, as my daily car is an Integra TypeR, I'm used to revving it's nuts off in all situations, so maybe that colours my view somewhat! Won't disagree on the fuel consumption point though...