440 power gains/ aluminum head advantages?

finally got consistent reading from intake centerline. i'm at 110 degrees and isky recommends 105. how much of a power loss am i having being 5 degrees off?
5 degrees retarded can be a big deal. What is the static compression ratio? If it's under 9.5, it probably wouldn't hurt a thing to get it down around 102 intake center line. I wouldn't even be afraid of 100.