They assumed you were using this crankshaft in a 351W SVO block.
If you take the measurements: (4" stroke divided by 2) + 6.200 + 1.280 = 9.480". It would be about .020" below deck on a 9.500" block. It will stick about .280" out of the hole on a Cleveland block.
Your only option at this point is to sell it all and start over with a Scat assembly....or buy a set of 408 Cleveland pistons, some 6" rods, and have a machinist turn down the counterweights so that they will clear the piston skirts.