WTB - 273 intake manifold 65 barracuda

Welcome to the site, Sharon.
I don't know if you are looking for the factory 4barrel intake...
But if you are just looking for a usable manifold, the Edelbrock D4B is one to look for. They are out there. It's a dual plane single 4 barrel manifold they made in the '60s that is drilled for the 273 mounting. Predecessor of the LD4B for later small blocks.