Would 1979 RV with a dodge 440 engine be unleaded?

No, a 1979 vehicle with a Dodge 440 engine would almost certainly require leaded gasoline. While the transition to unleaded fuel was underway in 1979, the 440 engine, especially in an RV application, likely had higher compression and valve seat materials that were not compatible with unleaded fuel. Using unleaded fuel in such an engine would likely lead to significant valve seat damage.