If this 727 was fitted with pax seats, it couldn't have been the missing fuel tanker from Angola.
I've flown those tankers and other cargo 727's and they all have all of the insulation and soundproofing ripped out to save the weight. Putting one back into pax configuration (even "African Standard") would be not cost effective even if it were possible.
And as anyone who IS familiar with the 727, the -9's were a joy to fly, compared to the real "lead sleds" which were -7's.
I agree with Airbubba, give me the -17R's or the Valsan conversion and day...