Flathead Jack's...all performance flatty stuff http://www.flatheadjack.com

Motor City Flathead
13624 STOWELL ROAD
DUNDEE, MI 48131
(734) 529-3363

Speedway Motor's
http://speedwaymotors.com/Default.asp?wc=true

Also, Edelbrock still lists heads and intakes in their new catalogs.

There is a place making superchargers for flatty's...I think Motor City was working on a fuel injection system for flatheads as well. Flathead jack is a very good place, they know what they are doing.