Thanks for the tips. The coil is fine, I replaced the old one and haven't run it too much with the car hard wired. With that there was not too much change with the new coil either, although the spark was more consistent. I ran new wires from the batt. to the ballast resistor, to the coil and then on to the dist. No change, but good idea about dist. position breaking a conductor. Spark does not fail with distributor position, it just seems to quit igniting the fuel with less than 20 degrees advance. Fuel pressure was OK, 3-4 psi running, 6 with the return blocked off. There is an audible difference with each plug wire pulled while running so it is working on all 6 cyl....
any other suggestions?
I am beginning to lean towards carburation again, but when I drove it the last time it really felt electrical. If there was a fuel shut off solenoid failing I might go there, but ... I dunno. Stupid flat tops.