Assuming (just for the sake of the discussion) that the projected path verifies, then the wind component acting on the entire FL coast will be out of the east. The velocities will be lower than storm maximum, by maybe 10% and the lack of fetch will help keep the surge down, somewhat.
A 6-9' surge really isn't a whole hell of a lot. There will be some flooding, for sure, but it won't be on a par with the really major storms.
If you think back to, say, Andrew - most of the damage to southern FL from that storm was wind damage. There wasn't a lot of flood damage at all, and Andrew was a bigger storm.
Right now NHC is projecting the bulk of the storm surge from Matthew to impact Merritt Island. Fortunately, there's not a whole lot there compared to other parts of the Florida coast. There's a good inundation mapping tool
here, on NHC's page.