That's good advice Bob, if the scoop is built in a way that it could be shaved that would be an alternative to building it up, like you said, it's 1/8th of an inch at the most.
I wouldn't recommend seam sealer for both aesthetics and function. Aesthetics aside, the hood is an area that has movement (opening and closing the hood, vibration etc.) also you've got heat from from the sun and the engine, at night you've got heat from the engine, I can see it failing. If it does fail, now you need to repaint the hood and the scoop...and probably make it fit right.