New intake for a 273?

65 273 intake bolts are smaller and at a different angle then 66 and up 273,318,340,360.

Newer intakes can be made to work with some modifications around the bolt holes and perhaps some tapered washers.

Start a wanted ad I bet there is a 65 and older 4bbl manifold out there with your new on it.

Alternately you can put 66 and newer 273 heads on it and use a 66 up manifold
I may just start that wanted ad when I have more money laying around for original parts. I’d love to simply change the heads but unfortunately I simply don’t have access to newer heads for that motor. I mean I have a 74 318 and a 72 360 but those combustion chambers aren’t as nicely shaped as the 65 273 has