Pulled Pork - 50 pds? Raw boneless, OK, you need between 2-3 quarts sauce per 10 pounds plus about 1 cup per 6 for table sauce.
Another meat / probably chicken?
Do 1 piece per person- a quarter is 2 pieces. You can bake/roast quarters and cut some in half. Well seasoned, not over-cooked.

Baked Beans- 3 gallons per 100 (4 #10 cans)
Coleslaw- 2 1/2 gallons per 100
Green Beans- 22 pounds per 100
Salad- use the plan for 100 table or one of the salad for 100 recipes, do just for 100 if you also have slaw

Rolls and Butter- option to do sandwich rolls for pork plus dinner rolls, but how about just baguettes or Kaisers to serve for both? You want about 12 pounds breads per 100. 3 pounds butter per 100.

Need some type of Potato. Baked are easy, see the baked potato bar for prep and hold if oven space is a concern, and toppings, these would also provide an entree serving for any vegetarians. Or scalloped with cheese, about 40 pounds raw per 100. Or hot German potato salad?