Doug's headers are a little bit less money but the same quality IMHO.
I run a 143 tooth flywheel with a steel can and the Doug's D-452 headers fit perfectly. I just needed to remove the grease fitting from my pitman arm and put a few notches in the flange of my bell.
Gus

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64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60