I've read on this forum that some people install 1/4" or thicker shims between the K-member and the frame rails. I almost had to do that with my Shaker hood 'Cuda due to running Indy EZ's, but I was able to get away without them. It is tighter than stock though.

You can see where the Shaker bubble rubs on the nearest corner in the pic. My '68's air cleaner rubs on the hood mat pretty good too, but it doesn't seem to cause noise or vibrations. The hood pretty much rests on the air cleaner ever so slightly, so I have engine limiting straps on both cars so it doesn't break anything..

Having some metal fly cut off the carb flanges was another consideration to lower the height of the intake, but I didn't need to go there.

I would like to be able to run the taller K&N filter on my Shaker, but it just won't fit in there without modifying the shaker bubble.