Exhaust Manifold Application Question

Hi, I have a pair of manifolds with these numbers...I did a search on this site and they come up as 318 manifolds. I know they were removed from a '73 340 duster but I only know the history of the car from '90 so they could have been changed out between '73-90 unless they are correct.

2843953 Passenger side "Center dump"
2951123 Drivers side "Rear dump"

Question:
Could these be used for a '67 barracuda with a bone stock mid '70s 360/auto tranny?? I set the drivers side on and it looks like the exhaust pipe might get close to the starter. Measuring the outlet, they look like 1 3/4 or so. I was going to run 2 1/2 as quick as I could.

Heres a couple of pics I sandblasted them then used POR-20 Black Velvet manifold paint. Cooked them in an oven at 500 degrees to set the paint.

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