help needed with 904

Hoping the local auto repair we'll have a rebuild kit and I can just start changing things out tomorrow and getting ready to put things back together the next day. I know that will never happen but I would like this to be quick and painless as possible. Now this has been sitting sitting with no fluid in it for many years on a garage floor. Oddly enough the front reverse and 3rd gear clutch is good which I thought that's where the problem would be. But it was the first and second gear clutches that looked all dried up and had dried like carbon or something on them and they look all like glued together in there. I also looked up the numbers on this transmission and I believe it's a 1968? If so do I have to go get a different kid? everything else looks like it goes up to 72?