Exhaust for a 1973 Duster 340 (Pics Included)

Untill the op post the vin and looks the car over what do you think you can do beside try to inform him what to look for?

Nothing else than.

Besides the power brake comment and a misdirect referencing 340s in general (NOT '73 Dusters), nothing. Until the matter is responded to by the OP, I don't know if it does or does not concern him. It's a huge issue to gloss over IMO and something I would certainly want to sort out.

At this point, THE point being made repeatedly, it's beat to death enough.

C'est la vie