I'm thinking of putting a (compact) type Paxton or Vortech blower on the 390, and use Edelbrock heads, with roller rockers. Maybe build it as a stroked 390, too.
I thought about taking a "CS SHELBY" lettered oval air cleaner, and having it welded up (in aluminum) to be an air box for the Holley, with the blower hose attached to the side. Of course, use a sidewinder intake, and "CS-SHELBY" valve covers.
Paint the block Ford blue, with polished metal and dark grey metallic detailing on the valve covers and air box.
Paul N.