I believe bartamos is correct, early military truck, part of the fording system which includes a PCV valve connected to the intake and other components of a closed system. Likely doesn't belong on that engine. Looks cool though. Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes 1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes 2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans 1947 Willys CJ2A w/F-Head engine