Srecko,
A B-24 usually carried twelve or less 500 pound bombs and the larger number only on short missions. If the kit provides eight, just hang two on each rack, one on the second-from top shackle and one on the second-from bottom shackle and assume they were flying a long-range trip. I have a bomb loading schedule chart somewhere in the attic that shows all of the possible combinations that could be carried.
Scott