Cat piss meaning 87?

Very nice tech very through. I have a couple questions:
The block has already been decked to what degree I dont know. Do I need to take it back and have them measure and possibly cut it some more?

Also about the heads. I bought my heads already rebuilt with new crane springs. I dont know which ones they used though. Do i need to dissasemble the heads and replace them?

You said I should use a quadrajet? So I should get a square to spread bore adapter?

Finally since my heads have guide plates can i use standard stamped rocker arms. Or am I that much better off with the scorpion ones?