I don't like to waste your time this discussion but I thought someone may have any documentation in his private library. I know it's very hard to find it (I've been searching for 2 weeks, not only via net) and I feel sure, you know that 74F1763 and 74F1764 are not the same.
Of course I can assemble some prototype, take oscilloscope and check all pins to find how does it work (I thought I don't have to do that).
If you have 14 pieces (one of distributors) I think it's a little stupid to sell it in "bulk", especially for $0.10 / kg!
For all that, thank you for help.
Regards.
Leszek