Help on rebuilding a 73 340

The '73 - 340 has a lower compression ratio, smaller valves.
This can be ignored during the rebuild with high compression pistons and work on the heads to install 2.02's. Or Edelbrock heads.

Sell the 302's, roll the money over into your build.

The stock intake and carb are very good street performers though your going to get a lot of people screaming get a Holley! If the TQ is in good shape, use it! The stock intake is also a very good performer. You can upgrade to a better unit later.
(A Weiand Action Plus or RPM)

Cam wise, a lot depends on the expectations you have and what else your to change.
What are your gears now?
Will you change them out to 3.91's or 4.10 or .....
And the torque converter will need to be changed for best results if not to avoid a sluggish car frma stand still launch. Anything greater than [email protected] on the cam specs should have a greater stall.

So a cam recommendation can not be made until other things are figured out.