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 would drive it like it is. If it is working, don't mess with it. Being 19, limited $ and probably mechanical xperience...... The performance increase for $$$ spent wouldn't make a great difference. Save you $$ if you like the car and find a 360 down the road. Enjoy it like it is- drive it