Real talk: exhaust manifolds on 360 Dart

Hi all,

(Editing to add: car is a '75 Dart 360 Sport)

I just found two good sets of stock exhaust manifolds for my 360 (current headers are abominable and since I'm building a street/daily driver type, I don't know if putting $1,000 into TTIs is the best route), and a good price. I'm wondering if there's any real world difference between a mildly built 360 using stock 360 exhaust manifolds versus using a set of 340 HP manifolds.

Thanks!