One thing I forgot to add...are you using the springs that come with the heads. I know they are not the right ones to work with the E303 camshaft. I just finished building a 30 over 302, I used windsor jr. heads and the E303, but I replaced the springs with some crane cam springs that crane recommended. I installed them at the proper height as well. Those stock springs are only good to like 5500 rpm max before you run into valve float problems.
Anyways give some more details.
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