The actual string length for a 69" Tamerlane would be around 66". Usually 3" shorter than the AMO stated length. A 35# bow would use about a 10 strand string, but I would go with a 12 strand to be safe. That is if you are using a B-50 endless loop string. Some like Flemish, I don't.
"DO NOT" use a fastflight string on that bow. You "will" break the tips.
Just FYI- I had a 35# 69" '67 Tamerlane. Smoooooth shooter. It developed a crack in the riser so I sent it back to Bear for warranty. They replaced it with a '68 37# 69". I didn't complain. Some purty rosewood in those risers.