london broil & short ribs 2morrow

You'll probably want to smoke the ribs at a low and slow temp around 225 to 250 deg. F. With that said, the london broil will smoke along quite well too. I'd think there wouldn't be much of a time variance however keep a therm in both pieces of meat to ensure they're cooked to your preference.

If I had to make a time estimate, I'd think you're looking at around 3-5 hours?

Don't over do the London Broil. I pull them out around 135º internal. Cut thin slices and across the grain at 45º (unlike I did in this photo