I have a 63 f-100 but the guy I bought it from said he thought when he bought it from the previous owner(I hope you followed all that) that he put a 60 or 61 in it. is there a way to tell? The heads were colored with ford blue if that helps but I understand that it was colored differant for cars vs trucks. Is there a number on the block or heads that would tell me the year of the engine? Thanks for your help.