Good luck. The usual rule of thumb is...
Colour negative - overexpose by one stop per decade of expiry.
B&W - overexpose by half a stop per decade of expiry.
Colour film tends to be more hit and miss than B&W in my experience as the dyes in the emulsion can deteriorate at different rates resulting in colour shifts. I’ve just shot a roll of 200asa Dixon’s branded film and ended up converting most of the results to B&W due to a heavy purple tint in the images. The B&W versions look pretty nice though.
Faster films tend to fare worse than slower films too, so that HR1600 might not be in the best state. You never know until you try though, so hope you fare well (and don’t forget to post up the results in here
).