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Thanks for posting
It sounds like the torque converter is not all the way engaged with the splines on the front oil pump, do not force it you will damage the front pump, remove the transmission and rotate the torque converter until it is all the way in and engaged with the splined shafts.
The flywheel mounting bolt holes on the converter should be about an inch back from the edge of the bellhousing.
Yes always put the converter on the transmission first making sure that it's all the way in, it has to go over three splined shafts, it can take a little while to get it lined up but you have to turn and push in at the same time.
You can bolt the transmission and engine together before putting it back in.
The converter must be on the transmission not the flywheel.