A Ford Top loader 4 speed is probably a direct bolt in. It was in my '65 Mustang.

Info on these boxes:

http://www.4speedtoploaders.com/

this guy does 'em right, not cheap, but lots of info regarding models etc.

Another site with lots of info:

http://www.5speeds.com/toploader.html

Did someone say 5 speeds? If you are going to the trouble to swap out, a T5 will bolt in also, giving you OD for low rev hiway running. Some sites with info.

http://www.moderndriveline.com/
These fellers got right back to me when I emailed them. The sell packages including cross members.

http://www.ttcautomotive.com/English/products/T-5.asp
info galore.... including other models with movable shifters.

http://www.allfordmustangs.com/Detailed/631.shtml
how to ID the T5 if you visit your local scrappy in search of same.

Good luck.