Call Will Bodley at Bodley Racing and Fabrication. He can build headers from scratch and is the best welder in the business. He's at:
1920 Sherwood Street
Clearwater, FL 33765
(727) 446-1210
Tell him I sent you, he'll treat you right.
After welding, either spray paint with VHT (buy at any speed shop) or have them ceramic coated (American Powder Coating in Tampa)