'AWHU was a -379C series which meant it was Ordered by Saturn - it came to BOAC with a collins 108 system FD and a flightdeck layout similair to the 747 eg fire handles on the o/h panel, FD on the coaming etc - hence the requirement for a few specialised crews - which since it was destined to fly JFK/NAS/BDA/KIN schedules meant it was a very senior aircraft.
This lasted for six months and then the '747' flight deck was rearranged to standardised with the rest of the 707 fleet and was flown by anybody qualified to fly 336's.