Best carburetor and intake manifold for a 273?

Right now all have done (Performance wise) is i got a dual exhaust with an X pipe in it and some off brand Magnaflows! i am in a debate on if i want to keep this car more stock just for cruising around and getting a project car and put a big motor in or if i want to dump it all into this.

I'd just keep doing one mod at a time as you can afford and see where that takes ya.
And you come across something that's begging for a built engine is always a future possibility.

Just dont get to far ahead of yourself or dream to big, that how project end up sitting on blocks for decades :)