Hi Gadget,
Rob had asked about that just the other day in fact. It would depend on the demand for it more than anything. We can make injector bosses to fit the lower manifold that would accept the domestic RC, Delphi, and Siemens injectors. They are MUCH more affordable than the Denso type. We've made fuel rail kits for other motor platforms, and really, it would be a snap to do the same for this manifold.
Here's an example of the injector bosses/ rail kit so everyone can know what we're talking about. Here is a Toyota 1jz-gte fitted with domestic Delphi injectors. Notice the aluminum injector bosses.
http://i15.photobucket.com/albums/a3...y/7acbc398.jpg