Howdy. I just did an EFI swap on my 84 (had same setup as your 83) which was somewhat of a headache grafting the EFI harness into the 84's. Lots of relocating to do such as battery, solenoid, radiator overflow, and some of the electrical system. The fuel lines bolted in on the existing fuel line mounting points. You will also have to find a different sender for the fuel gauge (83-86 style with electric fuel pump) or modify your existing one. I was going to do a write up of the swap but haven't gotten around to it yet. Feels like a totally different car. It was a fun project to do as well.
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Factory Five Roadster Build
Yellow T-roofed 84GT
(In users rides)&
20th Anniversary GT350 ragtop
[This message has been edited by fiveliter8 (edited 08-07-2001).]