Looking for 273 4bbl intake manifold
You can get a brand new Offy intake for the 1965 273 with the small intake bolts from Summit Racing. Its a single plane high raise thats good from idle to 6500 rpms. I have the same thing but the big bolt style. Its a great intake, gave me a smother idle then the Eddy performer I had before and no loss of power at low speeds and better power after 4000 rpms. Thats the intake I would get if you want brand new. Offy has many styles, dual plane, single planes with a high or low carb and dual carbs intakes all brand new still. Some are even right in stock at summit and would ship today.