I run about .006 in my eng and my old 440 with the KB pistons had about .005. My pistons in my 493 called for .003 to .005 for street and .005 to .007 for racing and I set them at .006 since I race it some. As was said you will hear some piston slap when cold but mine goes away in a few minutes. You should be fine but if its not together yet you could always do some knurling on the piston skirts. They dont do it much today as it exspands the skirt and you will have to file the knurl to get the right fit but I like the knurled pistons as the knurl holds some oil in it and helps keep the piston a little quieter. I used stock pistons on an old 383 that had almost .005 clearence in a stock bore eng honed out so I knurled them and then they would not even go in the cylinders and I had to fit them to the cylinders to get about .0015 that I ran on stock pistons.
But if it is together I would run it and just use 20w-50 oil. Ron