The date code for the FE engine block is below the
oil filter adapter mounting area. It's on the small angled part of the block. Look for a number/letter/number sequence. The first number is the year ex: 6 = 66. The next letter is the month using A-M but skipping the letter "I". So A = Jan, B = Feb and so on. The last number(s) is the day block was cast. Hope this helps a bit. G.