I am looking for headers for my '73 Duster that I am getting ready to put a 340 in. I really want Hooker Super Comps, but the 1-3/4" primary #5204 says it will only fit '67-72 A bodies. Anybody know why they won't fit the '73? I thought the engine bays were pretty much the same. Is the steering linkage that much different?

The 5116 and 5901 1-5/8" primary sets both say 67-76 A body.

Thanks!