Converting to a 84/85 SFI would require:
ECM, Wiring, and sensors
Coil pack
intake,fuel rail, injectors
turbo, throttle body, up + downpipes
Fuel tank and return line
86/87 would need the above plus
passenger side header
intercooler
electric fan
(I sure I am missing some things)
And either way, your still don't have the coveted BRF trans and 8.5" rear. Not an easy conversion. Best bet is to buy a SFI Turbo Regal instead of converting.