.480/230 cam in an 8.5 CR 360?

If you REALLY want a first hand understanding, here's what you do. With the engine assembled and timing cover off. Rig up some sort of starter mount. A manual bellhousing with a flywheel will work. Degree the cam straight up at 109. That's even with the lobe center. Now, get a compression gauge and measure cranking pressure in #1 and record it. Now advance the cam timing down to 100 ICL and get a cylinder pressure reading there. You will see the difference for yourself. It will not be accurate unless you degree the cam to 109 FIRST.