The stock Ford tank can be turned around easily at a radiator shop to either side. You can also shorten the tube that goes to the manifold to reduce the height, if you have that issue. Radiator shops pressure test the brass tanks after soldering and fix leaks if there are any.
I've had two of these built because my radiator needs a driver-side outlet. Cost to turn it around was about $60 here.
This is not rocket science. Radiator shops have been dealing with brass expansion tanks since they were built in the 60's. They look nice all polished up too.
Go here for a number of options on expansion tanks. Halfway down the page he lists what he can do and what it costs. Recommend emailing him or calling. George is real helpful.
http://www.gessford.com/cobraparts/fmisc.htm