Since the checklist at the FE desk says "707-3K1C", which to me is an indication that the variant they produced the CS707 from is an old Tarom Boeing 707-3K1C. (At least at the beginning according to my Airliners.net research)

EDIT:

After understanding the difference between advanced cowl and old cowl, I can say that Boeing 707-3K1C is an ADV variant. Now this confuses me since the CS manual gives clues that indicates an old cowl variant, while the checklist in their VC indicates an ADV variant.  :-?