zero deck pistons?

hey guys back again. is it normal to get a different measure from front o piston to back. used mopars method to find longest rod and used that 1 for all measures. and all were positive on 1 side and negative the other?. from front o engine # 1


front o pist back o pist above pin.
# 1 /- 0.009 +0.006
# 2 /+ 0.008 -0.006

# 7 /- 0.009 0.000
# 8 /+ 0.003 -0.003

- being below deck + above. kb 399 dome tops 0.020 over minus 6.cc.
does this just mean the deck not square to crank or somthing else?