1978 318 heads? Small port? Or large

That's all I have to go by Rusty. Books like this I read and learn from. Mr Shepard has made mistakes I'm sure as we all have. He has gathered information from greats like Tom Hoover, Jim Szilagyi,Bob Glidden, Keith Black, Ray Barton, Ted Spehar and dozens more. I don't need to get into a discussion about whether Larry Shepard knows anything or not. I just quoted what I had read. We can all draw our own conclusions and form our own beliefs. Mike