1973 360 upgrades

I agree with TripleR but I would look for a used one. Something about setting a new manifold on an old engine doesn't trip my trigger?

As far as carb recommendations, with the price of gas now, I'd get a used Edlebrock 600 that you has been gone through and don't look back.

If you feel you need to replace the throttle cable and kick down, I'd recommend the Lokar set up. You can get them from internet with black casing on them and the work smooth as glass when adjusted properly.