Carb recommendations???

I hope you realize that putting on a 4bbl requires supporting changes. The 4bbl alone will likely not do much but look nice. Being in highschool, this gets expensive in a hurry.
I read where you said headers. But again, you need supporting mods.
For sure these items will help breathing, but you have to look at the bigger picture.
The only road to horsepower is more torque, and the only road to that in a given engine, is pull in a bigger air/fuel charge.
So now you bolt on a bigger carb, and the headers, but what have you gained? The engine is still stuck in it's earlier operating range, and if it was not carb restricted then, the new 4bbl won't help one teensy bit (In fact if it has smaller primaries it may be even slower), until the engine starts to really rev; at about which time you either run into a speed limit or a rev limit, or a mechanical limit, or the limits of the cam and compression, or the exhaust pipe/muffler.
So supporting mods are; camshaft/compression,valve-springs,larger exhaust,freeflowing muffler,rear gears,and converter.
There is no downside to the headers, Slantys can use the help.
There is no downside to what you are contemplating,except perception and expectation. If you go the distance, you will be rewarded.But just to bolt on these two items, I fear you will be disappointed, and your bank account will be empty, and the ratio of dollars spent to performance increase will not seem to have been worth it.
Successful builds abound on FABO, so I really wish you every success. But please do not let employment steal your education.