Just an update for anyone interested: I was able to get the car to run fairly well with a lambda adjustment, but there was still hesitation and intermitant hard hot starts. Still too rich, apparently an internal leak and perhaps problems with the EHA valve. I bought a used fuel distributor/air meter assembly and made the swap this afternoon. At first I was concerned that there was still a problem running rich, some white smoke on initial start-up and idle. I think the computer was able to make the necessary adjustments and any excess fuel worked it's way through. As of this evening, so far so good.