Interesting project. Have followed some others that have done similar thing. I would like to do same, but need a different car to experiment on!Now that I've driven it with mega squirt for a week, it DEFINITELY has a large improvement over d-jet.
Big advantage you have, is the wideband AFR. Do you have sensors on both sides, or just after mixing?
I installed a, AEM Uego on my 350SL 4.5 - It makes all the difference to be able to set idle and load AFR at will. Currently have idle at about 13.8 and cruise (mid load range) at about 14.5. Djets would run a lot better if more owners & shops had a good way to set mixture. Most are shooting in the dark.
With good key djet parts like MPS, ECU, Trigger pts, distributor plus Pertronix to overcome any distributor wear, it is amazing how well a 44 year old djet runs.
Keep posting - enjoy seeing how you progress.