Keep it stock, or make it your own?

I get excited when I find a original (stock) A-body because it has not been hacked up yet. I have bought a couple that old people have owned and garaged in amazing condition, and they are the best finds. I modified both cars because one was a 318 and one was a slant. Some of the 340-360 cars are rare and a nice piece of history. I would keep them original or keep modifications to a minium-just my opinion. I appreciate both ways!