I was thinking of going with a dual exhaust but changed my mind. I have two rear dump drivers side manifold.
On the right is a NOS car manifold of some kind. It is obviously made to clear some kind of accessories or other space constraint.
The other one looks more conventional and is as removed.
$50 each or $100 plus shipping.
https://photos.app.goo.gl/ZsUFNnBPJFNyytgF6