727 question

we have a 727 behind our 360 magnum, car has never been driven, motor/trans are a fresh install. with the car jacked up in the past we were able to shift the transmission by simply pushing the lever on the transmission. We've run the engine a few times with the transmission in park/neutral to check for normal operation of the motor. the transmission did not have any fluid in it due to the fact we hadnt ran the trans cooler lines nor were we ready to hook up the B&M shifter bracket ext. While installing the driveshaft and u joint the other day we tried to shift the transmission again and the lever is completely stuck and we cant get it to move. is a transmission fine without fluid as long as its in park or neautral and not hooked up to a driveshaft or anything, what are the chances this tranny is now F$*KED?