A few years ago, I found some original FP4 (circa 1988) and thought it had lost about 1 stop when I tried it - just out of curiosity.
More exposure is the safe way to go, so perhaps start by rating it at 50 ASA.
Extra time in the developer to help with the counteract the loss of contrast would probably also be useful - say an extra 10%.
You are never going to get as good a result with old films as you are with fresh stock - but it can be fun just to have a play.
And so course - as a freebie, it owes you nothing.
Martin
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