Flexplate Help

Help! I bought a used 87 Hatch with a 302 and a C4 trans. I need to find out what flexplate it has. It has 164 teeth but I don't know how to tell if it is the 28oz or 50oz imbalance. I don't know what the motor is out of but it does have a one piece rear main seal. Any help would be greatly appreciated.
 
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