Specific bomb threat - Land ASAP and evacuate.
Used as an assessment question to up and coming captains by a company I worked for, "What would be an immediate action after receiving a specific bomb threat that you had a bomb in the wheel well bay?"
The answer is to get the gear down ASAP, allowing for gear door speeds etc. There is a chance the bomb will fall out but if it doesn't and goes off you may still be OK and you do have your gear down.
I wouldn't fly as a pax with an airline that flew twins and didn't instruct it's pilots to land ASAP after an engine failure.