Yup, that stinks man. I know your pain. When I bought my 76 it was because it only had a couple of rusty spots on the floorboards. Well, 4 yrs later I am mostly done with the extensive rust repair of this vehicle; floors, doglegs, rear inside fenders, batterybox and firewall, both front rockers, etc, etc. I should have known better. Amazingly the rails were completely rust free. Wierd.