Used Diamond W2 Aluminum Heads Yay or Nay?

I always pick the W2. But no way am I paying for a head that is decades old without a pressure test at a minimum. I don't care how good you are at porting, the Edelbrock head will never be a W2.

There are other choices. You can look at the Indy 360 heads if you don't want to buy used.

FWIW...I don't buy from Indy. I buy from one of their dealers. If I have to deal with Indy direct I don't deal with them. But that's just me.