5 ounces of dip remains. This is because if Issac made 1 quart and 2 ounces of vegetable dip and poured 3 cups and 3 ounces of it into a ball, we can determine what was left.
There are 4 cups in 1 quart and 8 ounces in 1 cup.
Subtracting 3 cups from 1 quart would leave 1 cup, and since 1 cup has 8 ounces in it we can subtract 2 ounces from 8. Leaving us with 5 ounces of dip.