I Am Considering Putting A Chevy 350 Crate Engine Which Has The Fast Burn Heads. The Exhaust Ports Are D Shaped. I Need To Run Shorty Headers Due To The Cramped Engine Compartment. I Have Researched Several Retailers And GM Sites, But I Can't Seem To Find A Manufacturer Who Provides Off The Shelf Headers For This Type Of Headers. Does Anyone Have A A Source Or Suggestion?  

First off, what kind of car is this for?

Second, I'd try Bassani or Borla.  

I have a 1985 Monte Carlo s/s with 383 stroker fast burn heads and Art Carr 700 R-4 trans. I have a set of hedman shorties on mine with fel pro 1444 gaskets. The gaskets have to be trimmed a bit as not to block the ports at the top.The gasket reccomended with the heads is the fel pro 1470 which also has to be trimmed. I have been told that the Hooker super comp 1 3/4 tubes will also work. I have not tried that. I am at present sending my headers back to jet hot to be recoated as the first coating came off.They said because i had the 1300 degree coating instead of 1700 degree coating that was not available at that time. They wanted $50.00 extra for the 1700 degree coating which I refused to pay. Hope this was of some help.Iam at present trying to find a set of stainless steel headers that will fit these heads and the monte carlo??
Good Luck to you;
Jerry