The injectors are located in the heads on an L67 and in the lower intake on the L36. The heads are identical in size. If you look closely on an L36 head, you'll see the injector bosses. They are not bored out...that'* how we can take the heads deeper when doing a P&P. We take from the boss area for a higher intake flow.
You can use L67 heads on an NA car, but why? A CFC will do much better than a roots type anyway. With an air-to-air intercooler, the charge temp is much lower that the heat-infested Eaton. The rotating mass is much less, as well. Plus, running a CFC on an L36 only requires a quick adjustment of the fuel pressure regulator. The PCM will handle it..the blowoff valve is mechanical and with no PCM to cut back the boost, you can dial up almost just what you want.
ZZP just did a turbo on their '99 GT. They have lots of pic on their site....some good plumbing work on this one.