Air gap small block intake -any brand testing?

The Eddy's are made in the USA, at least according to Edelbrock. The rest are made in China.

As far as flow numbers, no idea. I've heard of folks that have had core shift issues with both the Crosswinds and the Eddy's.

I run an Edelbrock Air Gap on the 340 in my Duster, haven't had any issues with it. The heads on the 340 were milled so the Air Gap was milled to fit the heads, but that would have been the same regardless of what intake I put on there. I bought another one to go on the 318 for my Dart.