I might add, a felpro 1009 headgasket used as a template to scratch the head before a valve job will need a small notch if they unshroud the head out to the gasket line, an 8519 pt will need a little more, it is just what I have seen looking up thru the bores. Some 400 blocks with the hugh chamfer are good to go. The 1009 is a good template gasket in my opinion, simple notch job.