Good luck on your quest. The USS Leyte was scrapped in 1970 and unless you can find out if someone knows what happened to the teak decking or you can find some kind of memorial with a ships store you probably won't find any wood available. I've collected all but one of existing battle ships decking through the museums and memorials (like the USS South Dakota) that offered items for sale you might find some. Be prepared to spend some money though. I bought some decking off the USS Missouri's (not original decking) and it was very expensive.
Best of luck and a very nice gesture for those that served.