Pete,
Your cousin has a nice looking truck.
What type engine set-up does it have (year, size, carbs, manifolds)?
Might that be a 55-1st series truck? The hood side emblem is for a 1955 1st-series Chevrolet truck. Does it have the original rear end? If yes, does it have an open driveshaft?
Thanks for posting the link to the photos.