Flexplate is not fits the torque converter
70 aarcuda has the right answer. I'll repeat: The TCI converter you have has no balance weights. It has a 10.5" bolt cirlcle. For any 360 or 5.9L I know of you need a flex plate with balance weight(s). For the 10.5" bolt circle for this big converter, this is the one you need: ATP Z-332