This is a great recipe. I found it in my Betty Crocker cookbook when I got married 34 years ago. Wouldn't change anything. The ham cooks quickly on the grill so baste frequestly and don't overcook.
These are my husband's favorite tacos. Made again last night. The corn tortillas are somewhat greasy after frying in skillet, even after laying on a paper towel. Be sure to slice the steak VERY thin. We added a teaspoon or two of fajita seasoning to the meat, along with a couple teaspoons of cilantro and juice from 1/2 of a lime.