Not that hard TBH.
Need 205 igniter
205 map sensor
205 ecu
205 temp sensor / but i beleive you can take the one out of your AFM and use that.
with the ECU i would recommend getting the MR2 version if possible that way you dont have isues with removing error codes for the the lack of chargecooler.
Its just a case then of moving wires around..
Only problem is the VE of the 185 engine is totally different to a 205 one ( cams etc ) so You maybe running rich / lean... Most people only convert to 205 ecu so they can run PowerFC or similar so they can then alter to fit engine..