My k-frame mount holes towards the rear of the car is rusty, thinking that if i weld it up it might weaken it overall. Has anyone done this? did it come out ok? Wondering if i'm better off trying to find a new one, from what i understand any 73-79 dodge charger, dodge magnum, plymouth satellite, roadrunner or gtx should be the same? Car used to have a 400, now it wil be a 440 with shumacher engine mounts.