Vince Falter at his Fordgarage site has a rather extensive library of Fordandia, including information on engine number and particularly foreign Ford engines identification/attributes. See
http://www.fordgarage.com/pages/ABenginenumbers.htm
You may want to check that chassis about half way down the right side (about under where a LHD driver's foot would appear) as it may have a number stamped into the top flange of the frame. Well, check that spot and the same spot on the right hand side (you say this is a RHD chassis?)
As the numbered engines were assembled into the frame, the frame was "co-stamped" with the same number as the block. You may or may not have the original Ford engine in that chassis.
Your engine may be a "small bore" British engine. A curious Ford variant, the "use tax" was set by engine displacement and small bore engines were popular. Also, any other details along with that engine number? Most American engines have an "A" in front. Other countries have different codes. Check Vince's page.
Joe K
Edit: Reading Steve's entry above: Vince's page does address the "missing numbers" along with other details of foreign production.