Ok ... It has been a while, but I finally nailed it. I have been in and out of town, working on this a little at a time for quite some time now.
After extensive testing, wracking my brain, (and one $100.00 magnetic p/u) I have solved the problem. .... It came down to an intermittent connection within a connector block.
The wire for the solenoid at the front drivers side of the carb was pulling out of the connector plug. It would vibrate until it broke contact and shut the fuel off. Then, after sitting for a bit, for some reason, the connection would re-establish itself and the car would restart as if nothing was wrong.
I re-seated the spade terminal in the slide connector, verified the contact, and it works great. No dying unexpectedly. The Subie is back. Yea!
Happy days....
Thank you all for the help with the brain storming ideas. It always helps to talk something out with others opinions added.