I do see the last three suggestions as workable. Engraved firechickens or dinos look nifty in pictures, but in-car on an engine they might seem a tad cartoonish. I think "FE Power" alone, engraved, is good and professional. I think Ken's idea, further refined by Dumpling (who appears, thankfully, to be over his extended acid trip. Maybe), cast between the exhaust ports, to be classic and appropriate. A general date code under the valve cover to clarify production runs in the future might be a good thing.