Every 6803 game has a free play adjustment
All 6803 games have a free play setting; its number varies by game (it is 42 on Eight Ball Champ, where 65 enables it), so look it up in the game manual.
Systems
Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)