Did all the 64 Darts come with Spark Plug Tubes?

My slant 6 dart doesn't have spark plug tubes, I'm having trouble getting the spark plugs out. I saw another slant 6 (same year) that had these spark plug tubes and they are easily accessible. Did they make some of these without the tubes? I thought this car was original (maybe not now) -- I'm having trouble even getting a tool in the area to get to the spark plugs. Suggestions appreciated. thanks.