Compression Ratio Question

Did your machinist say he was going to sonic test that block? At .060 over, you will be VERY lucky (like go play the lottery that day) if you dont have to sleeve between 2-4 holes to get the wall thickness you need. If he's not going to sonic test it and gaurantee the bores don't split, get a new machinist. Theres's a great one in FL if you need a name. The truth is, you can go with either. As posted, the 11:1 is a flat top, the 9.5:1 is the dish. If it was me, I'd go flat top and 11:1 and run a cam. That one you listed is terribly small. When you build an engine that is 20% bigger you can take the catalog recommendations and toss them too. Or at least look at them using some idea that the power ranges will be much lower, and the airflow needed is much higher. Not to state the obvious, but your builder and machinist should know that. Both should be familiar with longer than factory builds, and high performance work.