I just bought Dougs headers.. super expensive! but they fit great!! the slip joints on them make them alot easier to install.

1996 cummins diesel ext cab, long bed
1966 Valiant 4dr(318- 3.55gears, 13.31@ 102mph),
1974 Duster(360- 13.63@ 99.96 w/3.23 gears),
1933 Dodge DP (201)