Torque converter stuck! Need help!

I installed a A904 tranny in my dart over the weekend. Car won't move in any gear after install ( fluid is full) making a whining noise when in park. A friend told me I probably didn't have the torque converter in all the way. I pulled the tranny back out only to discover that now the tc will not come out of the tranny. The question is could I have damaged the tc or the pump by not having it installed properly??? Why else would it be stuck? When engine and tranny are bolted together there is no gap between tc and flex plate. That made sense to me but I was told there should be a 1/4 inch gap Thanks in advance for the info.