Anybody every play with or run a 576 head

I ran some earlier in my IHRA crate motor Stock years, but don't recall if there were any obvious differences. It was roughly in the mid-11's at around 3,500 lbs. 1.88" in., .474" lift) But I'd have to do some digging in my records to find more specific details. They are suppose to be an over-the-counter version of the 308 with the most obvious difference being no EGR holes under the exhaust. Always heard mixed reviews. Any other OEM heads in good shape available for a direct same bench comparison?