trans/converter question

so I am contemplating a trans freshening with shift kit and converter for my car, I have a pretty much stock 904 behind a slightly warm 360. My buddy put a new TCI tranny in the car and has a 904 that came out of his 71 road runner but it has a 426 in it.


He says that the bell housing is the same size as my 360 and the converter should work also. Now while I find that very far fetched and hard to believe i just had to ask what others thought because i can get the converter for free if it fits.


Thanks in advance