Flex plate

I am restoring a 73 duster 340 all numbers sunroof car. It is an automatic. When I bought the car it was completely apart. Now the 340 is rebuilt and I am mating the trans to the motor. I have the torque convertor slid in place and have the flex plate mounted to the motor. My problem is I can only get 3 of the 4 holes to line up on the flex plate to convertor. The 4 hole is about a 1/2 of a hole off. I have tried all 4 holes but none will all line up. . . . help. Any ideas?
Most Mopars run an "offset" hole in the flex plate to torque conveter bolt pattern.
Before I assemblied my 340 I marked the offset hole in the flex plate and the corresponding offset hole on the converter so they could be located after mating the engine to the transmission.
Now all you can do is hunt and peck your way through it until you find the combination.