How is the valve cover held on? Where are the motor mounts? Where is the distributor?
The only Ford six motors I am aware of that had the manifolds on the driver's side is the 215 - 223 - 262 series. All others, including flathead, Falcon, and 240 - 300 have the manifolds on the passenger side.
This has some good information: http://www.geocities.com/edwins63/I6ID.html
We really need a FAQ on how to identify vintage Ford six cylinders. I can volunteer accurate information on 226 and 254 flatheads and 215 overheads (and a little on the later stuff).