I would not worry about it buy the cam and degree it in and go on with your life. It says works well for engines 8.1 to 8.75 to 1 maybe the optimum may be 10 to 1 or 10.5 to squeeze the extra hp the aluminum heads will allow before detonation BUT 9.3 to one will be just fine.
going up to 10.5 would maybe net 14 more hp and 13 more foot lb on a motor making a little north of 400 through the mufflers you will never notice it. If you ran the car then up the compression they only way you would notice the difference would be a couple 10ths in the quarter you seat dyno will not be able to tell!

Just stop worring!