Wow, the misinformation!
the 90-94 323 had a 1.6 SOHC boat anchor. AFAIK
none of the manifolds from the DOHC one or the 1.8 motors work
The 90-94 protege had a 1.8 SOHC or a 1.8 DOHC (again the manifolds do't interchange)
In japan they had a 323 GTX and GTR which was an AWD 323 with a turbo 1.8 (bp). You can take the OEM turbo **** from these and bolt it onto the US BP or even a miata BP (although the exhaust manifolds face different ways).
The USDM 323 GTX was based on the older chassis and had a 1.6 DOHC turbo, most of the parts don't interchange.
If you bought that 323 you could buy an OEM turbo exhaust manifold and ECU and run a DOHC BP turbo from a 90-94 protege, 91-96 escort GT, escort LX-e, tracer LT-S, or maybe an early kia sephia. I'd use the mazda one because it has a main bearing support plate and IIRC the fuel lines are different.
Also the protege LX / excort GT/lx-e/lts 4 wheel discs and beefier suspension parts bolt into the 323.
The OEM GTX setup isn't good for very much power (175-220), to make a lot you need an SAFC and a bigger turbo. The 323 weighs in the low 2000# range and won't beat turbo civics very easily.