Shocks and double sway?

When I got my 65 Valiant Signet convertible in 1991, I began the wonderful journey of updating and rebuilding any and everything that would make this car great. I have succeded and it is truly performing now lovely.

My questions are these: In 1993 I put in KYB shocks and have driven the car EASILY over 100,000 miles. Would it be silly to update these and would it make a noticeable difference in driving? Note that I don't push the Signet very hard and only drive it for seven summer months.

My second question is about a rear sway bar. In 1998 I had a front sway bar installed and it makes such a difference. Does the additional rear take it to a level of extraordinary or is a front enough?

I love to improve my car when I can.