Try cold air for a while and see how the FE changes. I suspect you'll see a marked improvement. I like some of the aero modifications you've done to that car. Another thing you might consider is BOSCH EV6 aka Design 3 injectors. These have the same flow rate as your existing EV1 injectors but much better fuel atomization. You can find these all over the JYs in the same 19# flow rate in late 90s Ford V8s and 96+ non turbo Volvo 850s. They are all bright yellow and drop right in.
PN
0280155700 ford
0280155710 ford
0280155746 Volvo
Pintle type EV1 left (what you have right now), EV6 4 hole right.
http://farm3.static.flickr.com/2319/...79b3f801_o.jpg
http://i664.photobucket.com/albums/v...r/IMG_1206.jpg
I swapped my 960 over about 5 years ago without any problems. The FE improvement is marginal but it idles and starts much more smoothly.