Bryan commented, awhile ago, that someone at my bodyweight (170-175) needs only about 2500 cals to gain (of course some will be fat), which is about 15x BW. If they were to go to 3000, expect to also gain an additional 1lb of fat per week.
My impression from this is that many folks overestimate their intake needs when bulking; eating 3-4000+ then wondering where all the fat came from. (If I can find a reference to that post, I'll add it).
<span style='color:red'>Edit:
here's that post.</span>
Based on that advice, I'd say that you should be able to gain on be 2600-2800 cals. If you are going too far over that you may be gaining extra fat.
Everyone is different, and you may prefer to go hell-bent on gaining & diet it off later which is just fine if that works for you. Slightly lowering your cals may cause you to gain more slowly, and maybe gain less fat.
Just my 2 cents, based on what I have seen/read, on a very debatable subject. I'm sure others will chime in.