Motor is a T25 from 1971 I beleive. The manual says you can remove the inner timing side case without having to do anything on the primary side. I removed the out timing cover, the auto advance cam setup, and all the screws holding the inner case on, including the guide stud thing on the bottom left. I can get the case split about an 1/8th of an inch, but it really seems like somehting is holding it back. I normally wouldn't need to get into the gearbox but when removing the old brittle trans filler dipstick a piece of it fell down into the gearbox so I need to get that thing out of there. Any help would be appreciated, thanks!