It is difficult to answer this question because there are a large number of variables. First variable needed to answer this question is the % alpha acid of each of the hops that came with the kit. Second is what is the target IBUs of bitterness the recipe is supposed to come out to. Also the type of kit is also important. Is this an extract kit? Is it a partial boil or a full boil? What volumes? What grains are invloved and how much? Unfortunately all of these variables come into play to answer your question so it is impossible to answer this question with the information given. Here is a website that you can use to perform these calculations Beer Recipe Calculator
The target bitterness for a brown porter is 20 to 30 IBUs. Anywhere in that range would work great. I would suggest right in the middle.