Yeah, Andy, that's my point: I can't see what gain it would give; just extra weight.
Just got off the phone with Cecil, who drove & worked on the '64 Hemi (Missile VI) and inherited/bought/campaigned VII from '65 on. He doesn't recall any caulking at VI's scoop, though he remembers it ran 10.52 @ 131.88 twice...that said, VI was one of the early hand-built cars I referred to earlier. So if there's an absolutely untouched original '64 out there, it'll be interesting to see if it came with vent windows and whether it had the caulking.
Scott, my reference to the 2 scoops is just to illustrate the design difference. The taller/more angled one was what came on the '65 car before its 10"/15" conversion; but since it was one of the 4 lightweight HT A990 cars, that's the distinction vs the steel scoop. I always thought it interesting that they changed the design a little but not drastically.