Even if you put an elbow and extension on the vent it may not work. The hole it all screws in to in the case can't be submerged, if is, when the oil warms up it will push it out the vent. the vent needs to be in air space, even if you do have an extension on it.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-