The kit from Vintage Air is just under 7 inches with the center section has a dip which looks like would help middle clearance down under the throtle area. I needed to move engine back but don't want to gap the firewall. If I mount the fan straight to the rad core with black pull straps they sent.... I'm real close to making it but rather mount the fan with a small metal shroud. Plan has been to mount fan on the condenser side. Using that modified inner structure kit with no rods that has helped my hood/fender gaps. Anyone used one of those complete cab w/doors that are being made?