This is also a good casting number for L78 camaros in late 67 production? There is one for sale on camaro.net and this brought it to my attention that it only shows the "406 " for the 67 camaro on CRG. I have talked to guys with the 323 block in these camaros but have not seen first hand. Is this true? I was always told that late in production year you could have a 406 or 323 block? I was thinking around last week in June and throught July?