What are you planning on putting the EZ's into? I was gonna get some EZ's for the R/T/A but the Indy tech guy explained the reason for the EZ design. They are esentially the 440-SR head with a lower (stock) height exhaust port setup. They designed to give better inner fender clearance for A-body's. For a B, C or E-body the SR's actually have a better exhaust flow design. I belive they are the SR and the EZ are the same price too so it should really be the application that determines which one is better for you. If you want the stock height exhaust ports for header / exhaust manifold issues you'd probably be better off (about $1K cheaper) with a set of Eddy Performer heads. Just my .02