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No pilot bearing in there right? Flexplate is on the right way? Did you push the converter forward at all with a small prybar?
did you try turning the converter several times while pushing in on converter into the trans?
trans flush w/ block?
You're sure the converter engaged the pump, stator support and turbine?
When you drop the trans see if the nub on the converter fits into the back of the crank and allows you to mount the converter to the flexplate.