66 273 Cam and Intake Thoughts

An Edelbrock Performer 318/360 intake would be a good intake for this application.
It has the intake ports cast for the 273/318 ports, but larger runners behind these port openings.
This intake also allows you to run any of a number of carbs, small square bore AFBs, large square bore Holley, AVS, or Carter-Brock and Spreadbores like TQs and Quadrajets.
It will accept either the RV-2 A/C pump or the '79-'92 Rotary A/C pump.

On top of that, they are a dual plane, which is a good, street friendly design.

Another cool thing about them is that they are usually pretty cheap, in fact I know of one in nice shape for $75 and they go even cheaper, sometimes.

I suggest something like a stock 340 cam, as that 2 barrel 273 is really down on compression.

Mark.