I have the air gap intake installed withe the JTR mounts, but NO crossmember spacers. I have a 14x3 inch K&N drop base filter assembly, I think it's a 1 5/8 drop. and a holly 3310 carb. I have 1/4" clearence. I had to use a 1/4-20 nut to secure the top of the filter, because a plastic wing nut dinged my hood, the first time I closed my hood.