The manifold head flange is the same as a Miata 1.6. The miata, being RWD, has a totally different mounting of the turbo - it usually sits on top of the manifold placing it pretty much where the hood goes.
The stock flange is a IHI RHB5 flange - the only other turbo readily available that will bolt up is an IHI VJ11. You might want to look into a VJ14/Vj11 hybrid. There are a bunch of different hybrids out there too. There is a comprehensive list on the 323performance forum.
If you want a big turbo look into getting a custom manifold made, or modify a Miata manifold so the turbo mounts correctly.