Scratched Deck Surface

So there I was, I just got my 440 block back from the machine shop and I started prepping it for the build. I deburred the casting flash and smoothed out all the rough edges with a die grinder. I then took a round file and filed all the calcium deposits out of the water jackets. While doing this, I got a little too involved with my work and slipped with the file. Luckily I was able to avoid the cylinder walls, but I accidentally put a scratch on the freshly machined deck surface of the block between the last two cylinders on the left hand side of the block. The scratch is about three inches long and I can catch it with my thumbnail.

My question is.......Does anybody think that this is a major concern with head gasket sealing or any other issue? I hate to have to have the deck resurfaced again because of cost and time. Is this something I could maybe sand smooth with some emery cloth or just leave alone? Any input is appreciated.
Author: admin