I have the Headman Coated as well. Go to ebay, you'll save even more money. I had no fitment issues on my 440 ebody: As far as fitment goes, there are allot variables out there. Some have reported fitment probs, some wont. Frankly, as far as exh flange leaking, if you torque them corrrectly, as well as use high grade gaskets, (I use the soft aluminum kind and will never again use anything else) you wont have a leak