[Hot Rod Reverend]

Ok, let's add some more information and answer the question as to why a 239 could work. Most 239's were EBU engines. However, Ford used 239's also in their 1955 Trucks. Some have even been found in 1956 trucks though this is rare. The 55 Ford truck had a 239 that was different from the EBU in these aspects... 1. smaller camshaft journals (a 272, 292, or a 312 cam would fit) and 2. Hex shaft distributor and oil pump with the same number of teeth on the distributor/cam to match later 272's and up.