Well I finally found the problem. It turns out that the crankshaft position sensor was working well enough to fool the OBD but not well enough to supply adequate spark. When tested it was way below specs. I changed the CPS and installed a brand new ECS for good measure and the old girl roared back to life. I am not sure that I completely understand how the CPS affects the quality of spark. Checking for spark was one of the 1st things that I did. In hindsight, perhaps if I had paid closer attention to the spark intensity I might have saved myself a lot of aggravation. Thanks to all for your support.