Get as much as you can from a PRE- 88 MX-6. These were the same heads as the fuel injected B2200's and will make turboing a lot easier. Intercooler piping will need to custom. Intercooling is recommended. Maybe look into an MSD ignition system to deal with the timing, put check valves in your vacuum lines and brake booster. Again Russ is dead on about having a complete donor to work with. Adding a turbo to a non-turbo engine can be a frustrating experience. Pick up "Maximum Boost" by Corky Bell...there is a walkthrough of setting up a turbo system on a Miata. A lot of it is relevant to the B2200.
Exhaust manifold from Pre-88 MX-6 TurboStock MX-6 Turbo and wastegateIntercoolerIntercooler pipingBypass valve Coolant lines to the turbo( if water cooled Oil lines to turbo..may need to weld a bung in the pan and tap the block for an oil feed.Mx-6 GT Fuel pump, fuel rail FPR and injectorsBuild a downpipe with O2 bung
MX-6 VAF air meter and all sensors needed by the ECU: Intake air temp, coolant temp, Throttle position, IAC?, EGR?, Atmospheric pressure sensor, 02 sensorECU and harness.
That is far from all you need, but will get you started.
Here's some pics at the bottom of the page of what you are trying to
achieve:Turbo Swap