[LingLing]

I had the exact same problem when I swapped transmissions. I ended up having to shim the pivot ball with a few washers so the rod could fully disengage the clutch. Also make sure you don't have any air bubbles. It might take a bit to get all of them out but it's absolutely necessary to make sure they're all gone. You may also want to try adjusting your clutch when you get it to disengage just for some fine tuning.

FYI: I shimmed it so the bit of the clutch fork that sticks out of the transmission sits just to the right of center (If you're standing in front of the car).