I have a bunch of 263 specs in a pdf, but nothing matching your 1064-001... I don't believe any of the 263 valves are open center, but I could be wrong...
Call 877 fluid power, it's char-lynns number... They should be able to help with info... You'll want to know if it's open or closed center, load or non-load reacting, displacement and such...
If they are willing to send you catalogs with valve numbers and specs, take everything you can get... Could be real helpful in the future...