That carb is WAYYY too much for your cam/build.... would look for the holley 350 CFM QUOTE]
I agree. I run an Erson 270 cam and the 350cfm works real well.
As far as milling, its not the same on every engine. Measure, then mill. If it has never been cut .100 is no problem. That being said, I prefer to mill the block and just clean up the head.
sb