Depending on how much. Boost you plan on making I have a spare chrome 35t upper, tensioner and could work with you on the lower. I know the previous owner was making 18lbs he said on his 2.6 with 35t and 90t which most likely be more on a 2.8. Only problem is a manual tensioner is highly recommended.
Looking at the KB Boost Chart for a 2.8 a 35t with a 75t(Stock Size Lower) would net you a ratio of 2.14 which is about 20lbs of boost.