OOPS, Found the problem
I am sorry to report that I just read your previous entry on your torque converter. The large gap you asked about in your question is NOT OK and was the deal breaker for your flex plate. When you used washers to make up the gap you had, the pilot on the converter was removed from the crank that supports the converter and caused the bolts to try to hold the converter on center with the rotating assembly unsuccessfully. You can use washers as you were instructed to get the 1/8" gap, however there is a limit to how much gap you can make up with them. You must have 1/4" or more of washers stacked up I will bet. This is too much gap to make up with washers and will not allow the pilot engagement without extending the converter pilot dimension. The pilot on the converter holds a bearing that is pressed in and will release the bearing if you weld on it to extend it with a sleeve that some places will sell you to fix this problem. You are going to need a new pump bearing and seal at the very least prior to trying again. Tear down the trans pump and start over or your suffering will continue.
Sorry to report this, but the cause is obvious now after reading you previous question.
Bruce