I would replace the pan gasket with a modern hard gasket. The partnr. floats around on the forum.

You could decide to replace the throttle pressure shaft, gear-selector shaft and oilfillertube seals.

A TransGo reprogramming kit could shorten the time it takes the trans to make a shift, making it feel shift quicker, without actually being harser like some shift kits do.
But this would involve getting into the valvebody and do some mods in the housing.