With both your heights being considerably greater than average, in addition to an adjustable comb to raise it for your wife, both of you will need a unit called a pad adjuster to allow the pad to be lowered.
Without it, both of you will need to lean your neck forward to put your cheek on the comb of the stock. That will probably be required even if you both mount the gun with as much as an inch of the recoil pad extending above your collarbone.
You can confirm that you need a pad adjuster by mounting the gun as you normally do. With the empty gun mounted, have someone look at your eye from just beyond the muzzle. If the pupil of your eye is very near the vertical center of its socket, no pad adjuster will be necessary.
If it is nearer the top of its socket, a pad adjuster is recommended because shooting with the eye(s) looking "up" promotes raising the head during swings and shooting over targets. (Both the eyes and the neck lean encourage head raising and is why a pad adjuster would be beneficial.)
The goal for both you and your wife relative to the height of eh comb is seeing right along the surface of the rib with the gun mounted and the cheek having snug pressure on the comb. That helps keep the eye aligned with the rib during swings to targets.
Stock length: The stock is the correct length when, with the gun mounted and the cheek on the comb, the nose and thumb are separated by from one inch to an inch-and-a-half. Less separation risks the nose getting bumped by the thumb during recoil and much longer will make the gun much more difficult to mount consistently at flushed birds and more difficult to swing smoothly and therefore, accurately.