The S/S guys don't have a choice of hood scoop's.The reason they do not seal carbs to the scoop (I asked Joe Teuton @ The Southern Nationals this year)they needed some things like clutchless trans. and a few other things and in return they had to give up some things,and sealing the carbs. to the scoop was one of them.

I found out a few years ago,if makes a different on not just sealing your carbs. to the scoop but getting the scoop where it needs to be to get the cleanest air. Just remember to richen up your carb as well or you may not seen a gain.

PS I think the body style determines more of which scoop you need to use.