There will be interference at the cam lobes by the rods if you use 5.7" or 6.0" rods. You can either send your cam back and order a cam ground on a reduced base circle or you can invest in some rods that will clear the cam you have now. Scat makes a nice set of forged 5.7" rods that will clear the cam under part number 25700P. Stock 400 rods will clear the cam lobes, but create significant side-loading of the piston skirts.

The above was posted by techinspector1 on another board and I'd take it as gospel.