Depending on what year the block is, you can check the pads on the side of the block or up under the starter. Locate all the numbers you can on the block and if you can send me a PM on CC and I'll look it up on the trusty old blue/yellow FE book many of us have. It will be interesting to compare notes from my old motor; it always puzzled me that I never really got a straight answer from anyone on these 427 embossed blocks - just guesses or general information is where it ended.
