Surge (expansion) tanks, is it worth adding?

[Hart_Rod]

I'm debating on adding a surge (expansion) tank to the cooling system on my 68 supercharged truck. My current system works well, but I've been reading up on the LS cooling systems, and it seems tha all modern engines are designed to have a surge tank. I know most hot rodders and retrofitters don't add them due to lack of space or cost considerations, but I'm wondering if it would be beneficial to the engine and cooling system to make it work like it was designed.

Here's some heaving reading on the subject:

http://www.pirate4x4.com/tech/billav...CoolingSystems

I'm just curious if anyone has added the surge tank after the fact and if you have noticed a difference in how your engine cools? Thoughts and opinions are welcomed!