Father-Son 1974 Duster Project
I would look hard for a 340 manifold set, you can normally pick the 72 -73 up for about 300 a set.
Truck manifolds may give you fits.
I am thinking what to do on mine, I have a set of 340 manifolds, and a set of new coated headers a late friend gave me.
I think I am going to use the headers just because they were a gift, but manifolds are so trouble free.
Decisions, decisions.