to much fluid?

ok, i have had my engine and trans out to do work on them, hell of a time getting them back in with the headers.......anyways i am at the point where i am filling fluids, sent trans to shop for rebuild and engine got a good draining as well. oil, water went in fine. but when i was adding trans fluid, car not running, after several quarts, around 7 it started gurgling a little and then fluid started leaking out between engine and trans.....any suggestions on what i did wrong? not running engine cause the fluid to just fill up the res to much or something? i was told trans was dyno-ed, (have the sheet) but they told me they drained the fluids as well, any help would be appreciated.


sorry just to make it clear to everyone, 1970 Dart Swinger 318/904