Hi...I just purchased a 69 Electra 225 with 13,000 original miles. She's a gem. The decal on air cleaner shows "455-4". Antique license plates boast a 455 as well. However, the engine codes (block and intake manifold) show it as a number matching 430. Perhaps the previous owner bored her to 455? How can I confirm that this may have happened? Any way to identify the current displacement? Great community you have here. Thanks for allowing me to ask these questions.