I don't think there is a difference, they are just advertising to the "performance" image. I put Hedman headers on my '71 Cutlass S over twenty years ago. It had a 350/350 combo. I think if you call a representative and push them for specifics you will find that their headers will fit.
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Dan
'77 Cutlass Supreme
'46 2 door
"The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.
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