A904 Hard 1-2 Shift and Reverse

Good to hear. If you look at the illustration above, the slotted rod should just slide over the pin setting in the idle position. If it is under spring pressure you can unscrew it until it is in the right position. The shift mph can be fine tuned from there. That is a good place to start. I myself like a firm shift but the transmissions don't last long if it's the opposite and slides into gear at a low mph.
trans linkage.jpg
The car is running and still choked. What do you mean by the "pin setting"