My only advice is to bolt them together and have them milled to a common surface, otherwise your in for a bad time getting them to install and seal to the head. A lesson many of us has had to learn the hard way.

1953 Chevy 5-window 3100
In the Stovebolt Gallery
More pix on Picturetrail

Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain