Yes, that is the GMC series 102 "3200-equivalent" long-bed enclosed-drive-shafts driveline (102's 125.25" driveline vs the 100's 116" driveline). It was available during GMC New Design years (47-55).

http://www.oldgmctrucks.com/page0010.html

As posted above, "There were no 47-55st Advance-Design "3200-equivalent" Chevrolet trucks."

Therefore, the term "long bed" is meaningful for GMC New Design trucks, but there were no "long bed" Advance-Design trucks.

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.