As vacuum from the vacuum pump assists in the timing of tranny shifts it is important to fix any leaks in order to move ahead with tranny adjustments. Adjusting the Bowden cable tension and the vacuum modulator can then be performed to get shift timing just right. Don't overlook the Rack Damper Pin adjustment for dealing with vibration. Very simple adjustment and sometimes does wonders for engine idle vibration problem.
She's a beauty! Good luck with her.