Sway bar need?????

I am getting ready to start on my front suspension rebuild.
My car has no sway bar now and I was thinking of adding one.
At a car show yesterday, a friend of mine with a 340 Duster
suggested with the 1"+ tortion bars a sway bar isn't needed.
I don't want to change the tortion bars and add a sway bar
so I am looking for opinions on the better choice.
On my Comet, I changed the front sway bar to HD Mustang and
added an aftermarket rear sway bar. With the KYB's it is a little
stiff but breaking in nicely. Looking for opinions for my little
street cruiser---------
DR8)