'66 Formula S Torsion Bars

The factory bars I pulled out measure .890" diameter. I'll be putting the front suspension back together soon and wouldn't mind upgrading. This is a street car with stock exhaust, and car is a four speed. I've read many of the older threads but don't see anyone who has upgraded the bars on a '65-66 Formula S. Is it worth it? Will I feel any difference? I hate to throw money away on thicker bars if it doesn't accomplish anything.

I'm wondering if anyone out there has replaced their Formula S bars and what were the results. Thanks to all who reply!