Depending on your process you will use for the "steeping", you may not get the level of IBU contribution that BS is suggesting. There is a setting to adjust how much contribution you get from steeping hops if you follow a typical process and want to change it. For instance, I drop my temp to ~170F before adding my steeping hops and I consider their contribution to be <5% of 60 minute bittering hops, IBU-wise. In your case, it would be about the difference of 63 (adj) vs 76 (current) IBUs. Nothing too major, but enough to be considered (IMHO).