The menu item is basically your standard order of nachos with sliced jalapenos and nacho cheese, except with seasoned curly fries in place of tortilla chips. It's made with current menu ingredients so it's easy enough to order these after they're no longer on the menu.
It's not a common occurrence but they've offered topped curly fries before. Back in 2012, Chili Cheese Curly Fries were on the menu for a while.
Nutritional Info - Jack in the Box Spicy Nacho Curly Fries
Calories - 426 (from Fat - 245)
Fat - 27g (Saturated Fat - 4g)
Sodium - 1329mg
Carbs - 40g (Sugar - 2g)
Protein - 6g