Pasteur
Came across Pasteur south bound in Malacca strait 1958 (...)
No, Bob, "Pasteur" was no longer in Indochina in 1958. Her last voyage to Indochina took place early 1956. In 1958, she was under German flag being transformed in a Bremen shipyard as a real liner for Atlantic crossings, and was to be renamed "Bremen".
I am the author of a much illustrated book about "Pasteur" (circa 350 ill.), published late 2005 . It deals with the full story of the ship, from 1938 to 1980 ; alas, it is written only in French language. Hal Stoen's website about "Louis Pasteur" describes my book ("Louis Pasteur" is an error : the right name of the ship was "Pasteur" ; "Louis Pasteur" was a Liberty ship).
You have also a very rare color photo of "Pasteur" in this page from my own website :
http://www.jybaventures.com/~jybaventure/biblio_jybaventures.htm
(this photo, taken in 1955 at Singapour, is reproduced from the back of my book, which publishes other very rare color shots).