You can NOT rely on the marks on the dipstick.
Rely on the owner's manual and what Ford calls for. Back in the days that TSB was issued, the owners that put 7 quarts in complained the V-10 used oil. After they started to listen to reason and stopped at 6 quarts, the engines stopped using oil.
Again I say, unless you've made changes to the oil pan, 6 quarts is all that Ford recommends for the V-10. If you don't want to replace the dipstick, after changing oil and filter, refill the crankcase with oil. Run the engine for a couple minutes. Turn it off, let it set for awhile and using a file, put a new "Full" mark on the dipstick and adjust the add oil mark downward till it's the same distance it was below the original Full mark.
Or ignore good advice and do your own thing.