Taco Salad for a Crowd

3 pounds ground beef
3 envelopes taco seasoning (sometimes I use a bit less, so its not too salty)
Mix 3 heads lettuce, shredded
3 cups shredded cheddar cheese
3 cups chopped tomatoes
2 cups chopped onion
3 cans (4 1/4 ounces) chopped or sliced ripe -olives, drained
2 cans black beans or chili beans, - drained ( I use black beans)
1-large bag corn chips
1 bottle (16 ounces) catalina - salad dressing
1 jar (12 ounces) salsa (I use taco sauce most of the time, but have done half salsa and have taco sauce)

Brown beef drain. Add taco seasoning and prepare according to package directions. Cool. Toss with remaining ingredients in a large plastic bag or container.