HELP!! Torque convertor and flexplate issue

hey there so I installed a brand new externally balanced TCI heavy duty sfi approved flexplate into my dodge 360. I have been having trouble with the stock flexplate shattering under load condition so I spent the extra cash and bought a heavy duty one. Now when I put this in and lined everything up the halfmoon cutout would not line up to where I would have assumed would be a peek hole to where the drain plug is on the TC. So it would only line up 180 from that. Now when I torqued everything down and everything I started the motor up and there is this clanging sound coming from the convertor flexplate area. This wasn't doing this before. Now since the 360 is externally balanced the torque convertor has to be as well so should I have taken the weights off of the torque convertor of this new flexplate is externally balanced or what? To me it sounds like the flexplate is slightly hitting the bellhousing. I am really stumped any input be muchly appreciated!! By the way the TC IS AFTERMARKET 3000 stall