The Maryland Transportation Authority this week filed an application for $76 million in federal transportation funds to help pay for several planned road projects in the massive Port Covington development, but there may be one roadblock. The application for U.S. Department of Transportation "Fastlane" grant funds is based on the speedy passage of a $535 million tax increment financing, or TIF, request by city officials. "If they don't pass the TIF, the [grant request] would go away," said John…