So this weekend I bought a particularly good new American Standard Strat. I didn't research it or anything as it was a whim thing after bonding with it at the store. The Fender website claims it has a "copper-infused high-mass block". Does that mean it's zinc? steel? Anyway, I was wondering whether the Callaham block is a worthy upgrade in this case. Also looking for suggestions in the way of other upgrads, pickups, electronics, etc.