We have built several of these trucks and one certainty for all of them is they are noisy if driven at modern speeds. Even ones converted to door weather strip instead of the factory windlace. The cowl vent, windshield, doors, and any other part that moves are acceptable at 45mph and noisy at anything higher. Even the resto rod versions with all the floor board openings sealed, windshield sealed in place, and cowl vent welded shut will begin to lose a-c cool air at between 65 and 70. A triple layer, Lizard Skin, Dynamat, bubble wrap, topped with the jute pad and rubber mat muffles the noise but doesn't eliminate it. Engine noise can be decreased a bunch with a 1/2" thick felt pad laid on top of the rocker assembly; something I don't recommend but okay for parade/show vehicles. Beautiful truck I would drive in it's designed range and enjoy.
#1 - A 46 with V8, a-c, automatic,etc. Good a-c at 55mph and none at 70mph.
#2 - A $90k 40(same cab style) with radical re-work including weather strip conversion, ac good to 70mph:
