Tranny fitment question...

Hi, I have a 67 barracuda that I am in the process of installing a 360 either with a 727 or a 904. I have a newly rebuilt 727 now and a 904 that would need going through. If the 727 will go in there without beating the firewall to death I would like to use it and save the money of going through the 904.

What do you think??
Thanks Jim