my low buck street and strip ride

Hey mike or maybe some other guys could chime in on this. I just slapped a piston and rod in my 360 and was curious on average how much needs to be decked off the block to give you zero deck? Looks like its down in the hole about 30-40 thousandths from top of flat top. I also noticed one of the cylinders had a score in it. I tried honing it out but don't want to go to far. Any suggestions? Probably 3-5 thousandths deep at the most. Thanks man