When the torque converter is installed correctly everything will just fall together. The torque converter should be free floating, in and out, before you tighten the four nuts holding the converter to the flex-plate.

If you are having to use bolts to "pull it together' then your torque converter isn't seated correctly and you are about to DAMAGE the pump inside ($$$$) your transmission.

Please be careful and make sure the torque converter is seated in the pump. Rotate it till it aligns and you feel it drop in place.