It only sticks out about 2" from the PTO opening, From the picture It looks like there is plenty of room for one?
But again, that is not a big concern till you get it on the road and really use the truck, then you may want one, if you hardly use the truck you can do without. Either way, is has nothing to do with shifting between gears when driving.

Grigg

•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-