Denny W. A few days ago we did pull each wire to see if it would isolate the noise but it stayed the same on all cylinders.
Regarding transmission, I will get up under there and flex it more on the converter and see if it sounds like it can be an issue or just a normal movement. When I put the engine in I did not notice any apparent cracks and driving was limited to our long driveway. It is possible it got cracked somehow. If it turns out to be an issue I do have one sitting on another engine.
Is the flexplate likely to crack if the starter gear does not engage properly? I know this has happened a few times where the starter hits the plate not engaging gears as I think we need a shim in it.