That is _rather_ tight! Typical recommendations are for around .045 for typical hot rod type motors, although it has been a while since I've built anything. On a stock small block you would likely find about .060 (production tolerances and all). I don't know how tight the modern engines are built.
Now, all that said, sitting in my driveway is a 350 sb that I built that is running .028 piston to head clearance. It has about 30K miles or so on it. I did not build it as a hot rod motor but was experimenting with fuels vs. compression ratio. It has true 9.5:1 with cast iron heads. I would not want to turn it any tighter than 4500.
In an ideal world your clearance would approach zero while the engine is running but of course the question is at what rpm. What are you working on? .010 static seems too tight for anything I can think of.
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