318 cam

Let's back this up a second...........is this even an engine that SHOULD HAVE an extreme high lift cam?
Define should. What are the parameters that dictate a high lift cam?

In other words is this a stocker with low compression pistons? IF SO you don't want to put something in there that needs guide work as it simply will not perform with stockish pistons, etc.
This is not accurate except guide work.

And how about the exhaust system?
Has nothing to do with the cams lift.