You are in luck, Muscle Mustang & Fast Ford has been testing all the cylinder heads in the last several issues. 2-3 months ago was the entry level heads. I am traveling right now, but will look it up this weekend for you. Or...maybe someone else here can post for you. Make sure you get the entry 302 test. The magazine is also testing intermediate and full blown stuff. The E's will probably make 6-12 more hp. I think the AFR 165 head is the best and I know it made the most HP in the test I cited above. Check out their website
http://www.airflowresearch.com These heads cost about $1300 though...