I put a 1989 13B turbo in my 1975 Porsche. I purchased a running donor so I had everything I needed. The "brain" is different depending on the year. You will need a brain (ECU) and wiring harness from the same year as your engine. The 1989 and newer are slightly better than the 1988 and older. The wiring harnesses into the ECU are quite different (88 to 89). The JDM engines are very close to the Federal engines. That should not make a difference.
You will also need leading and trailing coils from a donor car.
The radiator needs to be larger than you would think. Again a donor car will get you the right size.
Make absolutely certain you get a factory oil cooler or larger. These engines shed much of their heat through the oil.
For my swap I used a Kennedy adapter plate for the clutch/tranny and left the stock Porsche clutch and tranny. Since you are going rear wheel drive, I would suggest using the Mazda Turbo II tranny. Get a custom driveshaft made. The shifter may have to be adapted to fit the "bugeye".
Use three inch exhaust tubing. I made my own downpipe etc. I went with a three inch Super Trap muffler that is tunable for noise output. Rotaries are incredibly loud but the turbo helps quiet things.
A Turbo 13B in a "bugeye" will be great fun! It is amazing how much power they make. With a car that light you will need wide sticky tires to put any power to the ground. I love my swap.
www.fc3s.org had the factory wiring diagram on line. I could not have done the swap without a very good wiring diagram. However, with it the swap was not that hard.
Go to
http://web2.airmail.net/atl/Rotary.html
to find a great write up on a 13B non turbo into a Porsche 914. Photos of my car are near the bottom of the page (Yellow 911).
I'll be happy to offer any help you may need to complete the project.
Quick question is the "bugeye" 6Volt positive ground"? If so you will need to rework all the wiring.