Pairing Up Balanced Torque Converter w Flex Plate

72 Dart, LA 360, 904.

We installed the trans and engine into the car at the same time, just hooked up the bellhousing bolts. Went to go install the flex plate to torque converter bolts.... And the weight on the torque converter made it unable to spin to match up the holes as it hit the corners of the flex plate when trying to turn it. Is this normal? I just want to make sure that it doesn't mean the TC is not all the way in. The TC is a stock replacement by the way. Thanks for the help, sounds like I'm splitting the two apart tomorrow to match up the flex plate. Fun stuff!