My 71 just has asphalt undercoating in the rear wheel wells, and not too evenly applied. I think the front legs of the rear flares were coated with the same stuff.
There are 2 rules to success in life...
Rule #1: Don't tell people everything you know.
1971 J-4700/Buick 350 Stage 1/TH400/D20/D44/D60/Koenig PTO Winch
2005 LJ Rubicon Pretty close to stock