It would be helpful to your cause if your son came with you to show that this option is something he wants and it is not just a parental request.
I think this is what would help you the most if you were in our school district - by the time kids are in 7th/8th grade the school staff is starting to focus on hearing what the students want from the students. I think that if you go in as a parent, no matter how many articles you have to back up your perception that the underachievement is due to boredom, you're still going to have a tough time advocating for placing your ds up into the honors track when he hasn't performed well in regular classes in science. In some ways, I think the school staff might actually be even less reluctant to make the bump for him when he's doing well in everything else, because that could be perceived as he doesn't really care where he's at in science and he's not personally invested in putting in the time to work and be successful at it (no matter how wrong this perception might be, it's a perception that might happen). Soooo, jmo, but I think the best way to prevent that from happening is to have your ds advocate for the change himself, either with you or trying it on his own.
I think you and your ds will also need to be able to answer a few questions such as: Does your ds really like science? Is it something he's interested in? And if it is something he's interested in, why hasn't he done better in class to date?
I totally understand he may have been bored to tears in middle school science - our EG ds has been, even though he's in an accelerated school. But I've also found that by the time students are in middle school, it is a very difficult argument to make for advancement and honors placement if a student isn't performing well in a grade-level regular paced class... no matter how high a student's ability may be. Teachers and school staff don't really want to hear about research and broad studies that give a student a reason for low performance; they want to hear something convincing from the actual student.
At least that's been my experience.
Best wishes!
polarbear