273 4 barrel manifold questions

The best dual plane intake for that engine would be an Edelbrock LD4B.

The D4B has the different intake bolts for the 64-65 273 unique head-intake bolts.


Stock intakes will not run as well as the dual planes.


If you want a new dual plane intake, I would recommend either the Wiand Steath or Action Plus depending if you are going to run a square bore or spread bore carburetor, they are available new.