Replacement manifolds for 360 in a 74 Duster?

Agreed, in-hand original casting can be checked easily, I have added the passenger side, the pics I included are directly off of the venders ebay link.

They are not mine, though I do have a few original HP sets both early and latter design if OP redecides to explore that rout.

Hey! I texted you yesterday to see if you would be willing to sell me the aforementioned manifolds...I hesitated initially because I couldn't make the trip to LA area and would have to ship them but it seems like you may be my best option. If you could give me a total estimate of cost and shipping to 94544. I'm the 408 # that texted yesterday if you prefer that route of communication.

Thanks again,
Ashley