Valve Springs

Hey gang,

I'm to a point where there isn't much more to do on the ride. It sounds healthy, drives healthy. My interest now is merely splitting hairs. I'm a bit bored and I also don't want to spend a kidney's worth of money. I've stumbled upon a few mentions of using different valve springs aside from the stock. I have a 225 from '74. Is there any performance improvement from using different springs from larger engines? Just a curiosity.

Thanks,
Zach