I've worked on a couple of 3350s and there is absolutely no end to the places they can leak. There are a few warbird operators that can keep them from leaking too much, but it takes a lot of hard work and "staying ahead" of the normal places they like to leak from.
Nico, we had 55 gallon barrels cut in half longitudinally to fit under the engines of the last B-17 I worked on. If the airplane sat for long periods those "catch basins" would eventually end up with several gallons in them!