Motorplate must have hole large enough to clear diameter of flywheel (flexplate) so starter has proper tooth engagement. Torque converter button will need an extension and 3 washers between converter & flywheel of same thickness as mid-plate. Don't omit button extension, end pressure will flex the flywheel causing rubbing, converter seal leakage, converter disengagement and/or flywheel cracking.
Or use a TCI Race Converter & TCI 745504 Midplate Spacer Kit, 1/4 Inch Thick. http://www.tciauto.com/