Since it's already opened up, I would carefully adjust the CO mixture screw to see if you can get some stability. My car came with the hole exposed, as well as the 3 brass screws carefully adjusted outside of spec, and I spent a while figuring out the proper setting after I fully seated the brass screws.
It's also worth it to remove the fuel lines from the control pressure regulator and make sure that the little flow screen isn't clogged up.
I think it was Martin that suggested unplugging half of the ECU (can't remember which half)- that's a good test as well. Killing the ECU removes the entire idle control system from the equation, so if you engine still can't run, you've eliminated a big piece of the puzzle and can focus on the basics.
How much more fun could you have with a car like this, anyway?