So I'm wondering if the heads from the GT500 might fit the GT350 5.2 block or even the Coyote? Imagine the HP from even betting flowing heads. Hmmm
https://www.autoblog.com/2019/08/05/ford-shelby-mustang-gt500-engine-details/#slide-1289857
https://www.autoblog.com/2019/08/05/ford-shelby-mustang-gt500-engine-details/#slide-1289857