Don't waste your time and money on a 20 year old system. Replace it with some modern tech. My suggestion would be to look at an MS3Pro Ultimate not their plug and play.
You already have all your wiring harness complete all you need to do is match the new ECU I/O to the existing wiring harness you have and maybe add a new fuel pressure regulator. Here is the link to the
MS3Pro Ultimate <= clickable.
If a new EFI system is a bridge too far, for about the same $1,400 you can buy a very nice, new Holley four barrel.