Dollar franc exchange rate
The Jackal says he wants half a million dollars as opposed to francs.
What was the dollar to franc exchange rate in 1963?
According to this historical chart there were 4.9371 French francs to the US dollar in 1963, so the Jackal was asking for nearly 2.5 million francs.
http://fx.sauder.ubc.ca/etc/USDpages.pdf
And using the CPI calculator on this site the Jackal's fee of half a million US dollars would be roughly $US 3.5 million in today's money.
http://www.measuringworth.com/ppowerus
I really need to get out more...