Chris Congratulations on the new crew member/future driver! In my limited experience with such things is something actually makes it into a cylinder and stays, you are likely to have a knocking sound. I had the end of a throttle linkage cotter pin break off and fall down an intake port when I was taking the manifold off. Motor started knocking and had me scared. Finally figured out which bank it was on and pulled the head and there it was. Fortunately no damage but a PITA. Hope yours works out as well. You might slap some mufflers on it to see if you can hear anything, or put a stethoscope on it.
Pat