Torque converter question

REVIVER said
1973 Duster, slant six, 904 trans.
I pulled the motor to regasket and change some worn components, timing chain, water pump ect. When I disconnected the torque converter there was already a white dot on the flex plate and conveter to mark arrangement. Problem is when I painted the motor the flex plate got painted and covered all evidence of the white dot. After install and tune I have a small harmonic vibration in park. Increases and decreases with RPM. I think its the converter not arranged correctly. Question; Is there a simple way to identify which holes the converter should be bolted to balance or is this going to be a trial and error, one bolt hole at a time, nightmare?

Thanks
Reviver

Do you think there might be enough white paint under the new paint so that if you sraped the new paint, the old color will show through? If the new paint isn't very old, you might get lucky and find the old paint dot. If the new paint is fresh enough, you might be able to find the old paint by rubbing the new with a cloth soaked in laquer thinner. Bill