at will continue shooting and shooting and shooting. The only things to be careful of are:
The older camera motors sometimes have a hard time pulling a full 400ft magazine. If they've seen a lot of hours, they may only be able to work correctly with a 200ft load, especially when overcranking. When you shoot your test footage, look for flickering in the neutral tones, especially white.
Also, be sure you form large enough loops with the film...you can easily hear the difference in between improperly formed ones and good ones. If you don't get good loops, your film will be black as the night.
Good luck, the ACL is a great camera and easy to work with.