727 TC Installed - Probably Wrong...

you may need to loosen the bolts connecting the trans to the motor also to get it to spin.. take it apart slightly to get it loose
you need to have a combination of movement between the motor and the trans to get the converter to sit correctly on crank
the cranks end has a round raised edge that the converter matches to and must be seated correctly
once the converter is sitting on crank correctly and the bolts are tightened the converter should spin allowing the converter bolts to be put in with someone turning the crank by hand with a wrench