Big Porter Help Needed Please

[stevefarns]

https://www.homebrewtalk.com/f126/black-butte-porter-145879/I am planning on brewing a porter that I can age for a year or more. I like the idea of using this Black Butte clone.
I'd really like to get the abv of the brew up to about 10%, so my plan is to bump up the 2 row to about 18lbs. (I will calc using software when I get to that point)
Obviously the higher grain bill will translate to higher gravity, I am wondering what other things I should consider if I am modifying the recipe that much?
Thanks for any help. Total rookie with significant mods to recipes.

 

[Brewmex41]

I don't have a specific answer, but maybe this can help a little.

http://www.deschutesbrewery.com/recipe/black-butte-xxii-clone

It's the Black Butte Imperial Porter
It says they do a 120 min boil, that's something to consider to help boost OG.

They don't give specifics, but maybe that can give you some more to think about.

Happy brewing