I had my 348 block decked 0.030" and I was hoping the intake would fit without machining. I can't quite line up the holes, and I could probably file the holes. But, I would like to know how much should be machined off of the manifold to make it fit properly. Unfortunately, my machinist passed away over the winter and I'll have to find someone else to do the machining, if I go that route. I'd like to know ahead of time before going to another machine shop just to check their knowledge.