Let me say this about the teak deck. I think if it had been installed in a different manner I would still keep the deck. However, the system they used to install the deck on my and many other 60's era boats didn't stand up over time.
First, they used an unsealed sub deck that was 3/8" thick and made of mahogany which is prone to dry rot.
Second, they placed 3/4" teak over the bare sub deck with a slight swiping of a glue of some sort.
Third, they used boat nails which cannot be pulled easily nor driven deeper. Therefore, as the deck wears the plugs above the nail heads wear thin and go away.
This is when water seeps into and under the sub deck and rots it. Then when you walk on it the teak crushes the rotted sub deck and the nail comes up further. The rings on the nail act like sandpaper and enlarge the hole so more water can seep below.
Eventually, black mold covers the sub deck and under it.
This is why I am replacing the entire deck and replacing any damaged stringers as I go. I am soaking the sub deck with penetrating epoxy, painting over that with a barrier coat 2 part epoxy primer and over that an epoxy top coat. This should prevent further damage from water and keep the mold issue at bay.