Realistic difference 340HP vs TTI early body headers 273

AJ/FormS said
Considering how much trouble the header-install is on those early A's, and the 273 power level, and the $ difference, I'm leaning towards the early HP 340 manifolds(69 to 71?), if they sneak by the steering column.But do you know there's a guy here on FABO that can supply big-mouth Magnum manifolds? He supplies them all cleaned up, and ready to install. search Trebleg.
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I looked into it but they looked like they were 2" outlet and i thought the 340's were 2.5? I was thinking the same thing about the 340's only because they were local. Arer there real gains to be had with the TTI's other than they look cooler and dump out at 3"???