Best intake manifold and carburetor for a 273

Any 318 small port intake will work. Original 273 intake and Carter AFB works very good, I would think the AVS II would work well also, since you can adjust the secondary air valve. Same goes for a TQ or Quadrajet. Use a 68 up 340 throttle cable bracket. You can even use an original 340/360 intake both of which are very good for cheap. If you are running an automatic trans, make sure the kickdown linkage works and is adjusted correctly.