DM, what I described was only one option and was the most used. You will note Vasco confirmed the flight time for the short Victor. Four Turbo confirmed to brackets for the long Herc. There was an option for two Victors which would push the long Victor flight time to 7 hrs 30 or so.
Fuel wise the Victor/Herc option was more economical than the Victor/Victor and more comfortable for the freighter.
Incidentally the freighter was not refuelled north bound.