About to build a 360 magnum for an A-body. Has anyone used these heads and if so are you satisfied with them? Most places I've seen sell only the bare heads and you supply the valve train. I found a place in Florida that sells the complete heads for 700.00 shipped to anywhere in the US and he pays postage for the return of your old heads and it doesn't matter if they are cracked, as mine are. These are supposed to flow better that the magmun rt heads, about 224CFM on the intake side. What's you opinion? Thanks for the response. Gary