I'm checking out a sweet Ranchero with a 170,auto, pretty clean, just one rust spot on the drivers lower front fender. My question is, there is some moisture inside, cause I can smell it, but the vents in front of the windshield has tape over it! I'm guessing it's leaking from there! Is there a way to stop it? Ie, by the heater core? Also where should I look for rust? The floors are solid! It needs a headliner, and at least one door panel, but I would get em both! I didn't get to open the lid in the bed yet! Is that a notorious rust spot? Any help would be great!