I just saw a video of a 55 Ford F1 build onto a newer chassis. Just realized what those louvers are for on the PS of the cowl just aft of the hoodline, most likely for the cabin fresh air intake. The louvers are only on the PS of the cab. Always wondered why the old Fords had those louvers on one side of the cab. That would be cool on the 56 Dodge but a louver section would have to be welded into a cutout section of the cab side cowl to make it work.