Yes, that scoop on the blue truck is a '65 A990 scoop.
IIRC, some large trucks had/have the intercooler mounted above the engine with ductwork plumbed to help circulate air across it.
This would be a nice compromise for the guys who want to run the old grilles, yet want intercoolers on the pre-'91 trucks and don't mind running a re-styled hood.
Mark.