I managed to get the inside of the rail cleaned of all buildup, but I've found that there's heavy oxidation where the O-rings fit into the rail. We're concerned about getting a good seal, since some of the metal is eaten away. We'll need to transfer the adjustable regulator over to my 2.8 or 3.4 rail. If we use the 3.4 rail, we will need to remove the fuel line to rail block and transfer the 2.8 unit onto it.
In any case, it will need the O-ring seal kit for the cold start injector if we don't eliminate it, and it might be a good idea to replace the fuel block to rail seal if we transfer to the 3.4 rail. Only available at The Fiero Store for $38. The O-ring kit is about $9.