Below is a picture of the setup I used to check piston deck height. First I zeroed the gauges against the deck then swung them over the edge of the pistons and rocked (no rings) the pistons until both gauges measured the same. Assuming that technique is ok, and please straighten me out if not, the results don't look good to me and I'm not sure what to do about it.

I have a new 383 rotating assembly kit from Speedomotive - Scat crank, Scat 6" rods, KB forged pistons. The block was decked to zero according to the person I bought it from. Don't have anything to verify so I tried using a carpenter's square so I realize I could be off there. I did verify compression height of one piston at 1.1305" (KB says 1.13). Haven't checked crank stroke (no appropriate tool) or rod length (rods/pistons are floating pin and I don't want to remove the spiral locks unless absolutely necessary). I did check the deck with a 24" machinist's straight edge, diagonally each way and then lengthwise down the middle. Found only one spot where I could slide .003 feeler gauge underneath.

All the pistons are above deck. I expected them to be .005 above deck but that doesn't seem to be the case. This will be a street motor. Any comments or advice please.
1 .007
3 .009
5 .017
7 .015
2 .021
4 .015
6 .019
8 .012