B.W.
Well, I can easily get our Britax Marathon (same size as the Boulevard) rear facing in our Chevy Aveo subcompact without even moving the front seats for my 6'3" husband.
Please go to www.safekids.org and find a CPST in your area to help you install the seat. Its really a snap to install the Britax seats but if someone shows you how to properly do it the first time, you will be doing a good thing. :)