I didn't even think about the B engines but they were numbered differently. You can find those listed on the link if you scroll down past all the A stuff. The number would have a B prefix on a car and a BB prefix on a truck. It should be June of 1933 according to that list.
http://www.fordgarage.com/pages/ABenginenumbers.htm
If it has a 18 prefix then it is a V8 frame with a model B engine and it would be a 1934. A lot of years have gone by so many changes could have happened.