i just got GT-40 explorer heads and intake for my 5.0 i also got a ford racing e303 cam and a little tighter valve springs than stock. i am looking to get new roller rockers and push rods but dont know what kind to get. also let me know if there is anything else i should replace while i have the engine apart. i have no idea what will work best with this set up. any help would be appreciated thanks guys.