ugh - I can't stand the flat black trend. Even if your car is multi-colored, the blue with the factory-type stripe showing still looks a lot better than some rattle-can looking flat black paint job. Don't waste your time or $ - your car will turn a lot more heads as it looks now, compared to a beater-looking, spray painted, flat black car.
IMO - flat black jobs don;t look good on muscle cars - save that for the hot rods. Flat black should only be used, IMO, in factory-type paint schemes that originally used it - like an A12 lift-off hood.
BTW - if I saw your car driving around, it certainly would get my attention - I think it's a nice looking car - even with the black fenders.