I'm trying to put Humpty-dumpty back together again and it would help to have the measurement from the back-top of the tub where the tailgate hits strait forward to the top of the cowl/dash. That or whatever similar measurement people use to know if the cowl is canted properly with respect to the base line of the tub. Mine is a '66 and I'm wondering if the 1/4" body to frame mounts are correct for my application, it looks more like I'd need 1/2" pads? I got it with a mix of old 1/2" pads and chunks of tire sidewall. Thanks folks.