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What's funny is that the one causing strife didn't actually directly refute the claims of such by the OP. To be constructive, different engine platforms, even if bored or stroked to similar dimensions, can have different sound characteristics.

Basically every Dyno test ever has shown headers help both tq and hp

Fwiw I ran a later one like that in my 69 Coronet with a 383 and the muffler shop made pipes with no issue

In various shows they use a 600hp and 350hp mill to test this stuff

In newer seasons they are a lot more thorough and probably would have rejetted. And it would have shown the 2.5" didn't lose that much. They showed in that and a couple other videos that muffler choice hurts you more than 2.5/3

That's an oldie. Wish they had rejetted for both exhaust systems, would have been less difference

I thought they tested different tailpipe sizes? Or was it just the full system?

There are some great engine masters tests on all this stuff

Not a direct answer, but make sure your guy has the right tooling to bend 3". I had a guy tell me he could do 3" but he really couldn't and I got a mangled mess back.

If you don't have a subscription to motortrend online get one and watch engine Masters, they've done a bunch of exhaust tests

Do you have full tail pipes? Best move to reduce inside noise

Supports off engine mounts are a good choice, something on the engine not the body. Not sure what someone would have done to melt a cast manifold other than run a hot diesel up a grade for an hour!

Headers can work but you definitely need to support the weight other than the headers. I used upside down rv manifolds on my fury. Front facing manifolds on a big block on the driver's side usually hits steering. The 62-65 manifolds are probably the best shot as their exits don't angle. You...

one on the left looks truck shaped to me