something I've been wondering about is if some one makes a flexible plastic version of the 67-72 inner fenders, something along the line of those on late model chevy pickups.
As far as clearanced fenders go, this is what the Previous owner did to the front fenders (bed openings still stock) of my truck in order to fit his wide 35s (equiped with puny 31s currently..) with a 4" lift.
