No. The '75-up heads without spark plug tubes use taper-seat spark plugs completely different from these gasket-seat plugs; the ZFR5N does not work in '75-up heads. The taper-seat plugs for the '75-up heads do not come with (or require) any kind of a seal ring or washer.
The only slant-6 heads with which you leave the metal ring washers on the spark plugs are the '60-'62 heads.